Click here to visit the donation page | View all sponsors
  Pennock's Fiero Forum
  Technical Discussion & Questions
  Check me please! (Page 3)

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version

This topic is 3 pages long:  1   2   3 
Previous Page | Next Page
next newest topic | next oldest topic
Check me please! by damittron
Started on: 12-04-2018 01:37 PM
Replies: 84 (1379 views)
Last post by: damittron on 02-16-2019 10:27 AM
viperine
Member

Posts: 1304
From: Pittsburgh, PA, USA
Registered: Feb 2015


Feedback score: (5)
Leave feedback

Rate this member

Report this Post02-12-2019 12:31 AM Click Here to See the Profile for viperineClick Here to Email viperineSend a Private Message to viperineEdit/Delete MessageReply w/QuoteDirect Link to This Post

I saw that you checked the exhaust for a rats nest. Have you tried starting the car with the oxygen sensor removed? This will reveal a clog that an inspection camera will not.

Our 88 formula got to the point where it would not start from a clogged cat (and subsequently discovered timing being WAY off). You seem to know what you're doing, but just to be clear, multiple marks are supposed to be present on the harmonic balancer, you will want to rely on the largest of these marks to set your timing in diagnostic mode.

Also double or triple check your two injector fuses to ensure they had not immediately blown after replacement.

I'm anxious to see what this car really needs, just like the rest. I am not a master mechanic, but just wanted to offer my view from the outside looking in!

Edit to add, use a test light on both sides of all fuses and be sure they are fully seated. My 87 GT had a fuse or two that just made poor connections and would only work intermittently, required a good cleaning and tweaking so that that terminals accepting fuses would actually be snug on the fuse. This car came to me with 65,000 on the odometer.

[This message has been edited by viperine (edited 02-12-2019).]

IP: Logged

damittron
Member

Posts: 70
From: St. Petersburg, FL USA
Registered: May 2018


Feedback score: N/A
Leave feedback

Rate this member

Report this Post02-15-2019 01:26 PM Click Here to See the Profile for damittronSend a Private Message to damittronEdit/Delete MessageReply w/QuoteDirect Link to This Post

 
quote
Originally posted by viperine:

I saw that you checked the exhaust for a rats nest. Have you tried starting the car with the oxygen sensor removed? This will reveal a clog that an inspection camera will not.

Our 88 formula got to the point where it would not start from a clogged cat (and subsequently discovered timing being WAY off). You seem to know what you're doing, but just to be clear, multiple marks are supposed to be present on the harmonic balancer, you will want to rely on the largest of these marks to set your timing in diagnostic mode.

Also double or triple check your two injector fuses to ensure they had not immediately blown after replacement.

I'm anxious to see what this car really needs, just like the rest. I am not a master mechanic, but just wanted to offer my view from the outside looking in!

Edit to add, use a test light on both sides of all fuses and be sure they are fully seated. My 87 GT had a fuse or two that just made poor connections and would only work intermittently, required a good cleaning and tweaking so that that terminals accepting fuses would actually be snug on the fuse. This car came to me with 65,000 on the odometer.




I am not a master mechanic either...obviously!

I have checked my injector fuses and power to the weather 6 wire connector, all is good. I did buy a noid light to check to see if they were being pulsed, but the noid light was bad, so I need to return it for a good one and get a bit more info there.

Timing was done by finding TDC on #1 cylinder, which lined up with the largest of the three marks on the balancer. I will for sure give removal of the oxygen sensor a shot to see what happens. At this point, I would try pretty much any idea people come up with. The car has good fuel pressure, good wet compression, good spark and all checks out with a diagnostic tool (OBDI), so I am at a loss for what could be going on. I have replaced pretty much everything except the MAP sensor and ECM, wihch both check out good with the diagnostic tool, so I didn't replace it.

I promise everyone I will keep up with the post so that when I do find the solution, it is documented...albeit a LONG post!

D.

[This message has been edited by damittron (edited 02-15-2019).]

IP: Logged

thesameguy
Member

Posts: 1414
From: California
Registered: Dec 2012


Feedback score: N/A
Leave feedback

Rate this member

Report this Post02-15-2019 02:18 PM Click Here to See the Profile for thesameguyClick Here to Email thesameguySend a Private Message to thesameguyEdit/Delete MessageReply w/QuoteDirect Link to This Post

Did you ever get the noid light working to verify the injectors are pulsing correctly?

Have you tried running the thing on starter fluid or ether or carb cleaner to try and isolate an ignition problem from a fuel problem?

Are you sure the fuel pump is staying running while you're cranking? I had a Ford malfunction that way once - the pump would prime but fuel pressure would drop off while cranking.

Have you done a volume test from the pump? Run the pump on 12v and collect the output from the FPR (return line) to something you can measure. Had a Saab with crusty fuel lines that had good pressure but no actual volume. Actually, still have that car... I haven't replaced the lines!

Do you have a known good FPR? Have you tried running the pump and varying the vacuum to the FPR to see if fuel pressure changes? Verified that the FPR isn't leaking?

Tried disconnecting the 5th injector (or removing it entirely!) to be sure it isn't leaking or making a mess?

Just some random thoughts that struck me!

IP: Logged

David Hambleton
Member

Posts: 1323
From: Stoney Creek Ontario Canada
Registered: Nov 2012


Feedback score: N/A
Leave feedback

Rate this member

Report this Post02-15-2019 06:51 PM Click Here to See the Profile for David HambletonClick Here to Email David HambletonSend a Private Message to David HambletonEdit/Delete MessageReply w/QuoteDirect Link to This Post

Twice over several years my 84 SE 4 speed quit without warning while driving. Both times it was getting fuel, spark, and the valve train looked operational through the oil fill hole.
Both times I changed the ECM and the engine started normally. Both times I exchanged the ECM again to ensure the ECM was the issue and it was. Easy fix!
I don't know how the ECM can prevent the engine from starting and I'm not saying the ECM is your issue, but it seems to have been twice for me.

IP: Logged

damittron
Member

Posts: 70
From: St. Petersburg, FL USA
Registered: May 2018


Feedback score: N/A
Leave feedback

Rate this member

Report this Post02-16-2019 10:27 AM Click Here to See the Profile for damittronSend a Private Message to damittronEdit/Delete MessageReply w/QuoteDirect Link to This Post

 
quote
Originally posted by thesameguy:

Did you ever get the noid light working to verify the injectors are pulsing correctly?

Have you tried running the thing on starter fluid or ether or carb cleaner to try and isolate an ignition problem from a fuel problem?

Are you sure the fuel pump is staying running while you're cranking? I had a Ford malfunction that way once - the pump would prime but fuel pressure would drop off while cranking.

Have you done a volume test from the pump? Run the pump on 12v and collect the output from the FPR (return line) to something you can measure. Had a Saab with crusty fuel lines that had good pressure but no actual volume. Actually, still have that car... I haven't replaced the lines!

Do you have a known good FPR? Have you tried running the pump and varying the vacuum to the FPR to see if fuel pressure changes? Verified that the FPR isn't leaking?

Tried disconnecting the 5th injector (or removing it entirely!) to be sure it isn't leaking or making a mess?

Just some random thoughts that struck me!


I have not checked with a noid light, the one I bought was bad. I did check for power at the 6 wide connector, I had 12V on pink and pink/white when cranking and when key was in the on position. I also replaced all of the fuel lines, so no problem with those. Last weekend I drained the gas tank again just to be safe, as the gas had been in it for 3 or 4 months. I checked it for rust and debris, nothing in it. I replaced the fuel pump and sending unit before I ever tried to start it. When I drained the tank, I used the ALDL jumpers to run the fuel pump, it pumped 10 gallons of gas in about 3-5 minutes.

I plan to check my timing again (definition of insanity is doing the same thing over and over expecting different results, but I have been known to be a bit crazy!), then I will replace my ECM if timing is solid. The car sat since 1994, so I fully expected to have issues like this. I enjoy the challenge, as well as the friendships it tends to build while screaming "HELP!" on forums! I can't wait to get it running and start making some shows where some of you guys are, it will be great to meet people who love these cars as much as I do!

D.

IP: Logged

Previous Page | Next Page

This topic is 3 pages long:  1   2   3 
next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock