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1995 Chevy K1500 5.7L--- EGR Issue

 
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Curt T Johnson

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Since: Jun 21, 2007
Posts: 3



(Msg. 1) Posted: Thu Jun 21, 2007 4:14 pm
Post subject: 1995 Chevy K1500 5.7L--- EGR Issue
Archived from groups: alt>autos>4x4>chevy-trucks (more info?)

Now I have seen multiple posts on the EGR valve and I have symptoms
of
a EGR problem however mine seems to be a little unique. I do know
when my ECU requests for the EGR to open it does and the valve opens.
The EGR solenoid and the Valve seems to be working just fine.

If i disconnect the vacuum line to the EGR my truck runs smooth
throughout all ranges of load. Idle on up. So I know its and EGR
system problem. If the EGR is connected i get stuttering at rpms
just
slightly higher than idle.


My question is when should the EGR be open. On my truck my
diagnostics scanner it shows to be closed ONLY when at idle. If I
start from idle and press the gas the egr will immediately pick up
opening the valve and cause stumbling ...until I reach approx 2k to
3k
rpm in which it seems as though the engine will smooth out( EGR still
open though). Why does my truck request the EGR to be open right
away. It seems like it is suffocating the engine at such low loads.


I am beginning to think that my ECU or an input to the ECU is gone
bad, which is causing it to pre-maturely request for opening.


Anyone have things I could check or other posts to read. However,
like i said before its seems like its not the common EGR solenoid or
valve stuck open.

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Curt T Johnson

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Since: Jun 21, 2007
Posts: 3



(Msg. 2) Posted: Fri Jun 22, 2007 6:05 am
Post subject: Re: 1995 Chevy K1500 5.7L--- EGR Issue [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

> Does it stumble when cold? My guess is its ignition related.
> Cheers- Hide quoted text -
>
> - Show quoted text -

No it does not stumble when cold. Apparently when cold the ECU wont
send a signal telling the EGR valve to open. As soon as it reaches
operating temperature the problems will start happening

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Martin Riddle

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Since: Dec 12, 2006
Posts: 108



(Msg. 3) Posted: Fri Jun 22, 2007 6:58 am
Post subject: Re: 1995 Chevy K1500 5.7L--- EGR Issue [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

"Curt T Johnson" wrote in message

> Now I have seen multiple posts on the EGR valve and I have symptoms
> of
> a EGR problem however mine seems to be a little unique. I do know
> when my ECU requests for the EGR to open it does and the valve opens.
> The EGR solenoid and the Valve seems to be working just fine.
>
> If i disconnect the vacuum line to the EGR my truck runs smooth
> throughout all ranges of load. Idle on up. So I know its and EGR
> system problem. If the EGR is connected i get stuttering at rpms
> just
> slightly higher than idle.
>
>
> My question is when should the EGR be open. On my truck my
> diagnostics scanner it shows to be closed ONLY when at idle. If I
> start from idle and press the gas the egr will immediately pick up
> opening the valve and cause stumbling ...until I reach approx 2k to
> 3k
> rpm in which it seems as though the engine will smooth out( EGR still
> open though). Why does my truck request the EGR to be open right
> away. It seems like it is suffocating the engine at such low loads.
>
>
> I am beginning to think that my ECU or an input to the ECU is gone
> bad, which is causing it to pre-maturely request for opening.
>
>
> Anyone have things I could check or other posts to read. However,
> like i said before its seems like its not the common EGR solenoid or
> valve stuck open.
>

Does it stumble when cold? My guess is its ignition related.
Cheers
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Martin Riddle

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Since: Dec 12, 2006
Posts: 108



(Msg. 4) Posted: Mon Jun 25, 2007 6:03 am
Post subject: Re: 1995 Chevy K1500 5.7L--- EGR Issue [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

"Curt T Johnson" wrote in message

>
>> Does it stumble when cold? My guess is its ignition related.
>> Cheers- Hide quoted text -
>>
>> - Show quoted text -
>
> No it does not stumble when cold. Apparently when cold the ECU wont
> send a signal telling the EGR valve to open. As soon as it reaches
> operating temperature the problems will start happening
>

Sure sounds like a lean miss then. But I would double check the ignition
system, then hoses for cracks, then for a manifold tbi gasket leak, then a
manifold leak.

Cheers
 >> Stay informed about: 1995 Chevy K1500 5.7L--- EGR Issue 
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