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87 GT is running rich !!!! What to do first ? by robert1234
Started on: 04-16-2016 08:44 PM
Replies: 37 (365 views)
Last post by: Kevin87FieroGT on 04-23-2016 09:54 PM
robert1234
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Report this Post04-16-2016 08:44 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post
Mine is running rich, what should I check or change first ?

Its not burn your eyes rich , but it has to turn over longer to start.

[This message has been edited by robert1234 (edited 04-16-2016).]

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Report this Post04-16-2016 08:51 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
first: check for codes.

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robert1234
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Report this Post04-16-2016 09:09 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post
Ok, I really need to order than code scanner. I'll do that...

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Report this Post04-16-2016 09:14 PM Click Here to See the Profile for Thunderstruck GTSend a Private Message to Thunderstruck GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
..

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If sugar-coating is what you crave... Willy Wonka doesn't live here.

[This message has been edited by Thunderstruck GT (edited 04-19-2016).]

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robert1234
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Report this Post04-16-2016 09:16 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post
Mine runs great, but a little black smoke at start up and it makes it hard to start too.
It always starts, but takes longer.
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Gall757
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Report this Post04-16-2016 09:21 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by robert1234:

Ok, I really need to order than code scanner. I'll do that...


[This message has been edited by Gall757 (edited 04-16-2016).]

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Patrick
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Report this Post04-16-2016 09:28 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by robert1234:

Ok, I really need to order than code scanner.


Got one of these?



Good, now read This.

If you're getting black smoke at start-up, I suspect you've got leaking injectors. A fuel pressure tester will help you with that. The pressure should hold for quite awhile after the engine is turned off.

The other thing it could be is a temperature sensor that's telling the ECM that it's minus 300°. I'm exaggerating a little, unless you're in Edmonton, but you get the picture.

[EDIT] Gall, you posted while I was searching for the perfect paper clip image.

[This message has been edited by Patrick (edited 04-16-2016).]

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Report this Post04-16-2016 09:31 PM Click Here to See the Profile for Thunderstruck GTSend a Private Message to Thunderstruck GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
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If sugar-coating is what you crave... Willy Wonka doesn't live here.

[This message has been edited by Thunderstruck GT (edited 04-19-2016).]

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robert1234
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Report this Post04-16-2016 09:32 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post
I got it, I'll check the codes tomorrow....I'm lazy with all the other scanners I have and bluetooth for my phone for my new cars... LOL

But paper clip it will be.
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robert1234
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Report this Post04-16-2016 09:33 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post

robert1234

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Thats exactly what it does !!!!!

Yep, it acts like it's flooded. Starts after cranking for a bit and starts with a cloud of black smoke.
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robert1234
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Report this Post04-16-2016 09:34 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post

robert1234

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So no cure for this ?

The exhaust tips inside are black also....

[This message has been edited by robert1234 (edited 04-16-2016).]

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robert1234
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Report this Post04-16-2016 09:36 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post

robert1234

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There has to be something, my 88 Formula does not do it...
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Thunderstruck GT
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Report this Post04-16-2016 09:38 PM Click Here to See the Profile for Thunderstruck GTSend a Private Message to Thunderstruck GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
..

[This message has been edited by Thunderstruck GT (edited 04-19-2016).]

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Report this Post04-16-2016 09:39 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
If you have no codes set, I would look to the Coolant Temperature Sensor, located on the passenger end of the engine, hidden underneath the bottom of the thermostat housing neck and behind the EGR solenoid. Sits horizontally, screwed into the lower intake. A search for temp sensor may give you a diagram of its location. This sensor supplies the ECM with info used to control injector fuel flow.

Edit: I'm not in Alberta but when the CTS failed in my 87, it was telling the ECM it was -28°f on a Georgia summer afternoon.

[This message has been edited by fierofool (edited 04-16-2016).]

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Report this Post04-16-2016 09:40 PM Click Here to See the Profile for Thunderstruck GTSend a Private Message to Thunderstruck GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
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If sugar-coating is what you crave... Willy Wonka doesn't live here.

[This message has been edited by Thunderstruck GT (edited 04-19-2016).]

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robert1234
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Report this Post04-16-2016 09:44 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post
I have the repair manual for it..., I may just replace the temp sensor, cant hurt.

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Report this Post04-16-2016 09:45 PM Click Here to See the Profile for TopNotchClick Here to visit TopNotch's HomePageSend a Private Message to TopNotchEdit/Delete MessageReply w/QuoteDirect Link to This Post
I was working on an 85 GT that ran rich, and the problem was the engine temperature sensor was disconnected. That's something to check, even if it's connected.
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robert1234
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Report this Post04-16-2016 09:45 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post
It bugs the crap out of me......starts up with a little puff of black.

I hate that almost as much as cutting the grass. LOL
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Report this Post04-16-2016 09:56 PM Click Here to See the Profile for Thunderstruck GTSend a Private Message to Thunderstruck GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
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If sugar-coating is what you crave... Willy Wonka doesn't live here.

[This message has been edited by Thunderstruck GT (edited 04-19-2016).]

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Report this Post04-16-2016 10:00 PM Click Here to See the Profile for Thunderstruck GTSend a Private Message to Thunderstruck GTEdit/Delete MessageReply w/QuoteDirect Link to This Post

Thunderstruck GT

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If sugar-coating is what you crave... Willy Wonka doesn't live here.

[This message has been edited by Thunderstruck GT (edited 04-19-2016).]

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robert1234
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Report this Post04-16-2016 10:02 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post
Ok, I'll try the foot down and see what it does when I start it.

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Report this Post04-16-2016 10:23 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
The Clear Flood Mode requires that the accelerator be depressed all the way to the floor and held until the car starts.
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Report this Post04-17-2016 03:34 PM Click Here to See the Profile for Thunderstruck GTSend a Private Message to Thunderstruck GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
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[This message has been edited by Thunderstruck GT (edited 04-19-2016).]

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Report this Post04-17-2016 03:47 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
Nope. Fiero has that function.
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Report this Post04-17-2016 03:49 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Thunderstruck GT:


That is on carburetors not F.I.


Not true.....according to GM Tuners

http://www.fiero.nl/forum/Forum2/HTML/129117.html

Where carbs generally add fuel when the pedal is depressed, Fuel Injection reduces fuel.

[This message has been edited by Gall757 (edited 04-17-2016).]

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Report this Post04-17-2016 04:06 PM Click Here to See the Profile for Thunderstruck GTSend a Private Message to Thunderstruck GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
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If sugar-coating is what you crave... Willy Wonka doesn't live here.

[This message has been edited by Thunderstruck GT (edited 04-19-2016).]

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Report this Post04-17-2016 04:32 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
I can't post a link from my phone but search for flooding in technical discussion title/username. Telo posted from the GM manual about the clear mode.
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Report this Post04-17-2016 04:49 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by fierofool:

,,,search for flooding in technical discussion title/username.


Charlie, isn't the following what you're referring to? If so, a link was already provided.

CLEAR FLOOD MODE
If for some reason the engine should become flooded, provisions have been built into the computer to help clear this out. If during cranking of the engine you depress the throttle more than 80%, the ECM will enter what is called “clear flood mode”. In this mode the ECM commands a delivered Air/Fuel ratio to very lean (usually 20:1). The ECM will stay in clear flood mode as long as the throttle is 80% or higher and the RPMs are less than about 600. As soon as throttle position falls below the 80% threshold or RPMs go above 600, the ECM disables clear flood mode and calculates fuel delivery based on coolant temperature and other factors it normally uses.
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Report this Post04-17-2016 05:28 PM Click Here to See the Profile for Thunderstruck GTSend a Private Message to Thunderstruck GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
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[This message has been edited by Thunderstruck GT (edited 04-19-2016).]

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Report this Post04-17-2016 05:44 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Thunderstruck GT:

the Pontiac dealer already changed everything they could related to the issue (outside of replacing the entire engine) and still to this day it isn't fixed.


Why don't you start a thread on your car and get better advice than 'change everything' from a dealer?
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Report this Post04-17-2016 06:00 PM Click Here to See the Profile for fierofoolClick Here to visit fierofool's HomePageClick Here to Email fierofoolSend a Private Message to fierofoolEdit/Delete MessageReply w/QuoteDirect Link to This Post
Sorry for the duplication but yes, Pat, that is the link. I was in the grocery store working from a small phone and missed all the replies while I was searching for something to back me up.

[This message has been edited by fierofool (edited 04-17-2016).]

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Report this Post04-17-2016 06:26 PM Click Here to See the Profile for Thunderstruck GTSend a Private Message to Thunderstruck GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
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[This message has been edited by Thunderstruck GT (edited 04-19-2016).]

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Report this Post04-17-2016 07:02 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by robert1234:

It bugs the crap out of me......starts up with a little puff of black.

I hate that almost as much as cutting the grass. LOL


Leaky injectors will do that. Check to see if fuel pressure falls quickly after you turn the car off. Pressure should hold for about 5 minutes.....otherwise it is leaking into the cylinders.
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robert1234
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Report this Post04-17-2016 10:24 PM Click Here to See the Profile for robert1234Click Here to Email robert1234Send a Private Message to robert1234Edit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks everyone !

Great information.

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Report this Post04-18-2016 08:49 AM Click Here to See the Profile for IanT720Click Here to Email IanT720Send a Private Message to IanT720Edit/Delete MessageReply w/QuoteDirect Link to This Post
Super rich more often than not is the Coolant temp sensor. Had it happen to me with two seperate Fieros. And my bronco.
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Report this Post04-20-2016 01:37 PM Click Here to See the Profile for YannskyClick Here to Email YannskySend a Private Message to YannskyEdit/Delete MessageReply w/QuoteDirect Link to This Post
Look at the 7th injector switch. Mine was defect and let the cold start injector working all time...... This switch sucks 160$.....
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Report this Post04-23-2016 09:44 AM Click Here to See the Profile for Kevin87FieroGTSend a Private Message to Kevin87FieroGTEdit/Delete MessageReply w/QuoteDirect Link to This Post
O2 sensor?
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Report this Post04-23-2016 09:54 PM Click Here to See the Profile for Kevin87FieroGTSend a Private Message to Kevin87FieroGTEdit/Delete MessageReply w/QuoteDirect Link to This Post
O2 sensor?
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