V6 EGR and codes
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V6 EGR and codes
I'm working on a 4.3 Vortec (multi-port injection) in a 1995 S10 Blazer (I've got an '83 Camaro too!). Anyway, it's idling very roughly, and has a very slow start unless you give it a little bit of throttle- and then it starts right up. But it basically RLS and misses/idles very roughly at low speeds. This is my son's car, and I'm trying to work on it and help him out while visiting from out of state for the Holidays.
Evidently the 94-95 Blazers are kind of in limbo between OBD I and OBD II. This truck has the OBD II style underdash plug.
When I put an AutoXray EZ Scan 6000 scanner on it, it would say "vehicle not responding". After three calls to AutoXray/Actron, I finally got out of them (painfully) to set the scanner vehicle configuration for a 1996 GM product.
OK, so now I can scan and observe operational data. I'm not very skilled or experienced reading the scanner, but most things seem OK, the water temp is good, it goes into closed loop, throttle position and rpm change when you hit the throtttle and etc. I don't know the correct values on some of the other readings though.
So then I selected trouble codes on the scanner. The only code I got was multiple misfires on all cylinders. No EGR codes or anything else.
My son had a new EGR valve installed a while back and it did not solve the problem. They were also supposed to have put new spark plugs in and give it a "tune up". He took it back several times but the problem was never found or the performance of the engine helped.
I'm thinking that I might pull the new EGR off again and clean it up, try to clean up the manifold passage if I can, install the screened EGR gasket and hope that helps.
So my questions are-
Is there something else I should be looking for or trying while th scanner is hooked up?
Does this seem like an EGR problem?
Why am I not showing other trouble codes during the scan?
what other codes might or should come up for this condition?
What code would show if I unplug the EGR? I've heard some people say to just unplug it, and others say that is no good. Is it really needed if you do not have to smog check?
Thanks!
Evidently the 94-95 Blazers are kind of in limbo between OBD I and OBD II. This truck has the OBD II style underdash plug.
When I put an AutoXray EZ Scan 6000 scanner on it, it would say "vehicle not responding". After three calls to AutoXray/Actron, I finally got out of them (painfully) to set the scanner vehicle configuration for a 1996 GM product.
OK, so now I can scan and observe operational data. I'm not very skilled or experienced reading the scanner, but most things seem OK, the water temp is good, it goes into closed loop, throttle position and rpm change when you hit the throtttle and etc. I don't know the correct values on some of the other readings though.
So then I selected trouble codes on the scanner. The only code I got was multiple misfires on all cylinders. No EGR codes or anything else.
My son had a new EGR valve installed a while back and it did not solve the problem. They were also supposed to have put new spark plugs in and give it a "tune up". He took it back several times but the problem was never found or the performance of the engine helped.
I'm thinking that I might pull the new EGR off again and clean it up, try to clean up the manifold passage if I can, install the screened EGR gasket and hope that helps.
So my questions are-
Is there something else I should be looking for or trying while th scanner is hooked up?
Does this seem like an EGR problem?
Why am I not showing other trouble codes during the scan?
what other codes might or should come up for this condition?
What code would show if I unplug the EGR? I've heard some people say to just unplug it, and others say that is no good. Is it really needed if you do not have to smog check?
Thanks!
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