First of i apologize to the mediators becuase this is a 4th gen camaro question, but I know that the guys who have tought me everything i know hang out on these boards.

First of i apologize to the mediators because this is a 4th gen camaro question, but I know that the guys who have taught me everything i know hang out on these boards.

here is the deal, girlfriend drives a 98 camaro V6, it is lately running like garbage. Me being car buff boyfriend say sure i can fix your car, well the EGR is nothing like the ones on our cars. It has three wires going into it, even if i disconnect it the car does not through a code. Basically i think it is the EGR because the car runs really great when cold, but once it gets hot it is for some reason it really leans up and stalls or runs really weak with only 15,000 miles. Checked out the whole car, cannot seem to find anything wrong. How do i check these new EGR valves? does this sound like a symptom of a failing egr valve?

 

If it was the EGR valve, it would set a code. These cars use a Linear EGR Valve, which incorperates a pintle position sensor. The PCM constanly monitors actuall position versus desired position. A variance of like 5% will set a code. So if the valve was stuck open, the check engine light would be on, with a P0400 or something similar.

It would be interesting to see if there were any codes stored (can't use the paperclip anymore)

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wouldnt it stil be under a warrenty of some sort???

Steve

 

Thanks guys. Both good point. Man i do not like newer cars. The dealer said nothing is wrong, but i assure you the differance between hot and cold is night and day. Even when i disconected the wire harness going into the egr and drove around the block i still did not get a check engine light. well thanks guys, all i can say to that is that is why i love my 92 Z.

 

Is it missing or is it just sluggish??
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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
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GO #3

[This message has been edited by Engineboy (edited October 04, 2000).]

 

Actually, for my money the digital EGR is the only way to go. It's generally a lot more accurate than the vacuum diaphragm type, since positioning is absolute rather than vacuum dependent. The big hangup on newer PCMs is the less-than-friendly way to access the diagnostics. Once you have the correct interface, however, you'll see that diagnosis can actually be easier. I think there's even a code for determining which seat someone farted in last, and what day and time, with suggestions about what they had for lunch the preceeding day. (A 'PO0p00' code, as I recall.)

Many of you guys are probably not old enough to remember, but I've heard the same kinds of grumbles about engine controls since the early '70s, when EGR first appeared. Many people considered the PCV to be a nuisance back then, and were totally blown away by solid state ignition and later fuel control in the late '70s. I think the technology actually makes it easier to repair, as long as you remain current with the technology. It certainly has made our cars better than their predecessors (in general), and probably is making newer cars that much better. On the other hand, I wouldn't turn down a pristine '68 SS just because it didn't have a PCM...

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Vader
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"(A 'PO0p00' code, as I recall.)"... LOL.


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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R

GO #3

 

Actually, there is a difference between a Digital, and a Linear. The Digital EGR has three solenoids, one for each different sized orifice in the mounting plate. A linear has a pintle actuated by a stepper motor, much like an IAC Valve. There is also a potentiometer (variable resistance position sensor-like a TPS) integrated in the valve. That way if the PCM commands 50%, it looks for 50% plus or minus 5%. The Linear EGR valve is superior to the Digital becuase of the self diagnostic capabilities. Just my $.02.

------------------
If you live in Southeastern US, check us out!
South East Thirdgen

"I used to have a handle on life, but then I used it as a plunger and broke it" -The Wave

ASE Master Tech + L1
Savannah, GA
'87 Trans Am-K&N,Cold air induction, SSM SFC, Boxed LCAs, 8mm Accel wires, Flowmaster, 16" GTA rims.
'97 Bonneville SSE