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what could it be? by vincent
Started on: 05-25-2014 03:24 PM
Replies: 16 (313 views)
Last post by: vincent on 05-27-2014 03:47 PM
vincent
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Report this Post05-25-2014 03:24 PM Click Here to See the Profile for vincentClick Here to Email vincentSend a Private Message to vincentEdit/Delete MessageReply w/QuoteDirect Link to This Post
i have an 2.8 v6 from 1987)
it has bin stocked for 6 years.
the engine cranked but didn't start.
after done a bit of research i found out the fuel pump was bad.
i changed the fuel pump and the engine starts :-)

but the problem is , it's just like the engine runs on 3 cilinders , it's just a tank , stuttering, no power,
i checked the ignition and i have sparks on al 6 plugs , the timing is also good ; cilinder 1 stands on 10 degrees.(tested with strobolight)
i saw thazt if we start the engine there came smoke from the exhaust manifold at the firewall side.
if i step the gaspedal , the engine is about to fall still.
i hear also a great air sucking noise at the bottom of the egr-valve.
and i hear also a bang if i stopped giving throttle at the exhaust manifold at the firewall side.

what could this be?
can anyone help me with this issue?
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ag9123
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Report this Post05-25-2014 04:01 PM Click Here to See the Profile for ag9123Click Here to Email ag9123Send a Private Message to ag9123Edit/Delete MessageReply w/QuoteDirect Link to This Post
It sounds like a cracked EGR tube under the intake manifold. very common problem that creates a giant vacuum leak...Rodney Dickman sells replacements...

------------------
1984 Indy Fiero

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Gall757
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Report this Post05-25-2014 04:32 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
You still may have low fuel pressure. Check to see using the little Shraeder valve on the fuel rail. I should be about 32 lbs. with the engine running. Also check for blockage in the exhaust system.
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FieroJimmy
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Report this Post05-25-2014 04:58 PM Click Here to See the Profile for FieroJimmySend a Private Message to FieroJimmyEdit/Delete MessageReply w/QuoteDirect Link to This Post
With it sitting for years, the injectors may also be sticking.
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vincent
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Report this Post05-25-2014 05:10 PM Click Here to See the Profile for vincentClick Here to Email vincentSend a Private Message to vincentEdit/Delete MessageReply w/QuoteDirect Link to This Post
the egr tube was crackrd , but i repaired it.

i will check the fuel pressure valve but don't know how to do it.

is there a way to test the injectors?
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Gall757
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Report this Post05-25-2014 05:34 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
Quick way to check fuel pressure....

1. find the valve cover on the fuel rail...passenger side...see the link.
2. Turn key on, engine off....listen for fuel pump.
3. gather some rags and a fire extinguisher, put on safety glasses.
4. unscrew cover.....it looks like a bicycle tire air valve inside.
5. press that pin in the center with a screwdriver.
6. notice how high the fuel goes... it should hit the bottom of the deck lid.
7. Clean up the fuel. If the pressure was lower than the deck lid, get a gauge.

http://www.fiero.nl/forum/A...130314-2-114650.html
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Patrick
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Report this Post05-25-2014 05:40 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 vincent:

it's just like the engine runs on 3 cilinders


Maybe it is. Did you check both fuel injector fuses?
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vincent
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Report this Post05-25-2014 05:52 PM Click Here to See the Profile for vincentClick Here to Email vincentSend a Private Message to vincentEdit/Delete MessageReply w/QuoteDirect Link to This Post
both fuses are checked and are good.

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vincent
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Report this Post05-25-2014 05:55 PM Click Here to See the Profile for vincentClick Here to Email vincentSend a Private Message to vincentEdit/Delete MessageReply w/QuoteDirect Link to This Post

vincent

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i think the previous owner had a problem with the fuel pressure cap or so .
because where the cap supposed to be is a rubber line with a bold screwed in to lock it.

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85 SE VIN 9
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Report this Post05-26-2014 04:21 PM Click Here to See the Profile for 85 SE VIN 9Click Here to Email 85 SE VIN 9Send a Private Message to 85 SE VIN 9Edit/Delete MessageReply w/QuoteDirect Link to This Post
Mine ran fine before sitting 2.5 years. Now like yours, but can be driven. Try new gas and fuel additives. New air filter. Also clean intake. Try to keep it running. Probably better once warmed up.
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BrittB
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Report this Post05-26-2014 08:24 PM Click Here to See the Profile for BrittBSend a Private Message to BrittBEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by vincent:

the egr tube was crackrd , but i repaired it.

i will check the fuel pressure valve but don't know how to do it.

is there a way to test the injectors?


Repaired or replaced?

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Csjag
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Report this Post05-26-2014 08:51 PM Click Here to See the Profile for CsjagClick Here to Email CsjagSend a Private Message to CsjagEdit/Delete MessageReply w/QuoteDirect Link to This Post
My 85 GT that I bought a few months ago had sat for 2 years with a bad fuel pump. I dropped the tank and cleaned it and replaced the fuel pump. I put in fresh fuel along with a heavy dose of Lucas fuel injector cleaner. It ran very rough like yours when it finally started and I had to let it run for quite awhile before it started running smoothly.
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2.5
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Report this Post05-27-2014 11:31 AM Click Here to See the Profile for 2.5Send a Private Message to 2.5Edit/Delete MessageReply w/QuoteDirect Link to This Post
Was timing set with the ALDL pins jumpered?
Also new fuel filter?
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vincent
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Report this Post05-27-2014 03:42 PM Click Here to See the Profile for vincentClick Here to Email vincentSend a Private Message to vincentEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Csjag:

My 85 GT that I bought a few months ago had sat for 2 years with a bad fuel pump. I dropped the tank and cleaned it and replaced the fuel pump. I put in fresh fuel along with a heavy dose of Lucas fuel injector cleaner. It ran very rough like yours when it finally started and I had to let it run for quite awhile before it started running smoothly.

[This message has been edited by vincent (edited 05-27-2014).]

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vincent
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Report this Post05-27-2014 03:43 PM Click Here to See the Profile for vincentClick Here to Email vincentSend a Private Message to vincentEdit/Delete MessageReply w/QuoteDirect Link to This Post

vincent

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quote
Originally posted by BrittB:


Repaired or replaced?


i've taken the mount plates and welded a new stainless steel tube on it so it's new but repaired

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vincent
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Report this Post05-27-2014 03:44 PM Click Here to See the Profile for vincentClick Here to Email vincentSend a Private Message to vincentEdit/Delete MessageReply w/QuoteDirect Link to This Post

vincent

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Member since May 2014
 
quote
Originally posted by 2.5:

Was timing set with the ALDL pins jumpered?
Also new fuel filter?


yes the pins where jumpered.
the fuel filter is a new one.

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vincent
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Report this Post05-27-2014 03:47 PM Click Here to See the Profile for vincentClick Here to Email vincentSend a Private Message to vincentEdit/Delete MessageReply w/QuoteDirect Link to This Post

vincent

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Member since May 2014
it's a new fuel pump and i replaced the feul tank also.

i hope i gonna find the problem.
i gonna check the valves.
i gonna try another egr valve and i gonna borrow another egr tube to test.
but after that i don't know anymore what to do. besides checking the fuel pressure and injectors.
is there a easy way to test the injectors at home with no special tools?

grtz
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