Rough Idle after warming up 92 SSEI - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-09-2008, 06:37 PM   #1
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Default Rough Idle after warming up 92 SSEI

Hello all,

Got a 92 SSEI with about 125k on it (don't know exact mileage as the dash cluster is going in and out). The behavior I see is that when the car reaches normal operating temps it starts to idle very rough - dipping rpms and shaking the car a bit. I am fairly new to working on cars but have a little experience.

Some basic things I have done so far:
Replaced plugs/checked wires.
Checked PCV valve
Replaced Serpentine belt (was worn)

I am looking for any and all suggestions for what the problem would be. Used to have an engine light on but after changing the plugs this went away.

Thanks
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Old 01-08-2009, 02:07 PM   #2
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No thoughts anyone?

I have another sympton that I think could possibly be related. The engine seems to miss a little when driving with the gas held steady. Its not like stalling out or anything but it is noticeable. I found this thread which seems like a similiar problem but no solution is really posted:
https://www.gmforum.com/t255152-2/

I am gonna pull off the dist caps and take a look maybe tonight or tomorrow, but anything else I should check? I was also thinking of changing out the fuel filter but I can't seem to find the fuse to turn off the fuel pump?

Also I see people saying check the EGR but I thought this model didn't have one? How can I tell.

I really appreciate any and all response. Thanks.
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Old 01-09-2009, 03:50 PM   #3
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Well I tested the coils per instructions on the how to guide (thanks Dan). All reading 5.3k Ohm so I believe that is good. Also I pulled one plug at a time and got arc on all the connections so it looks like the coil is good.

Next thing on my list is to get a new fuel filter as soon as I can figure out how to disconnect the fuel pump. If anyone has an idea of where this relay is that would be great. I found some under the hood but they are not labeled as far as I can tell.
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Old 01-10-2009, 04:42 PM   #4
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Quote:
Originally Posted by chantspel View Post
Well I tested the coils per instructions on the how to guide (thanks Dan). All reading 5.3k Ohm so I believe that is good. Also I pulled one plug at a time and got arc on all the connections so it looks like the coil is good.

Next thing on my list is to get a new fuel filter as soon as I can figure out how to disconnect the fuel pump. If anyone has an idea of where this relay is that would be great. I found some under the hood but they are not labeled as far as I can tell.
actually they are. pull the black cover off and look inside of the cover. it'* even color coded.


there is a fuel pump relay under the passenger side kick panel dash area.
and there is a diagram under the kick panel as well. remove the kick panel and turn it upside down.
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Old 01-10-2009, 04:46 PM   #5
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kinda rough but does give you an idea.
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Old 01-11-2009, 08:05 PM   #6
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Thanks toddster the diagram helps a lot. I will take a look at it tomorrow and see if I can find it.
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Old 01-12-2009, 02:22 PM   #7
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OK so I did find the relay... unfortunately I can't seem to pull the fusebook out (the glovebox is kinda in the way). So how do you pull the relay without tearing about the glovebox? Do I try to reach up there and pull it out? Thanks for the help
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Old 01-12-2009, 06:30 PM   #8
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Thats what you need to do, reach up there. Or at least that is what I've done. Don't think pulling the glove box out will help.
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Old 03-14-2009, 08:33 PM   #9
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Sorry for not responding sooner, crazy busy but was finally able to replace the fuel filter.

OK so here is a quick recap of what I have tested/replaced so far:

New plugs and wires
New Air and fuel filter
New PCV Valve

I tested the MAF by uplugging it and starting the car. Car ran worse, so I believe MAF is OK?
I tested the IAC by removing it and running car. Car idles fine but at about 1200-1500 rpm. What does this mean? I also cleaned the IAC (tip was black).
Tested the TPS via Dan'* how to/ resistance was fluid through range.

Any ideas for further testing/diagnoses?

I am thinking maybe 02 sensor??

Thanks guys.
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Old 03-14-2009, 09:07 PM   #10
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If the O2 is old you should replace it. It might help. But seeing it'* giving you trouble when hot I still think it'* the IAT sensor. Also clean the MAF. Have you done a seafoam top clean? I've seen this do good things in the past.
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