tch777
1/2 ton status
I have had an issue with my 1991 suburban stumbling and dying on me. Engine has 177,000 miles and is stock, have minor mods, k&n air filter, TBI pod spacer, the salad bowl air cleaner mod, a high flow cat into a 3 inch single exhaust. Sometimes at idle it will stumble and recover and other times it dies, also sometimes under throttle it will have the big hesitation and continue running but once in awhile it will just die. Sometimes it will set the 42 code othertimes no SES. IF it dies you can smell rich gas and have to put the throttle to the floor and crank a long time to restart. And then on other days it runs like a champ. I have done the following:
Replaced timing chain, seemed to fix issue for 2 weeks then same old. Replaced distributor with new that included new ignition module. new plugs, wires, and rotor and cap. Did a new ECM too. New fuel pump relay and oil pressure swithch. Fuel pressure is 11.5 PSI last I checked few months ago.
Fixed vacuum leak between TB and spacer 2 times and finally pulled spacer and went back to TB to intake finally it is staying fixed. I also ran new grounds from the battery to the firewall, and to the frame rail, also took off and cleaned all the other grounds. Base timing is 2 BTDC with the connector pulled. All sensors are new within 3 years. Also replaced the injectors 5 years ago. They seem to have a good pattern but I see some dribbles once in awhile. oh and the EGR and charcoal canister are I do have a short somewhere in the dome light and horn/ciggy lighter power circuit I have not found yet too, not sure if that is contributing.
I have a couple winaldl logs could someone check them out? I have searched and read for days but really have not found enough data to know what I am looking at. Can't seem to attach the logs?
Thanks
Tim
Replaced timing chain, seemed to fix issue for 2 weeks then same old. Replaced distributor with new that included new ignition module. new plugs, wires, and rotor and cap. Did a new ECM too. New fuel pump relay and oil pressure swithch. Fuel pressure is 11.5 PSI last I checked few months ago.
Fixed vacuum leak between TB and spacer 2 times and finally pulled spacer and went back to TB to intake finally it is staying fixed. I also ran new grounds from the battery to the firewall, and to the frame rail, also took off and cleaned all the other grounds. Base timing is 2 BTDC with the connector pulled. All sensors are new within 3 years. Also replaced the injectors 5 years ago. They seem to have a good pattern but I see some dribbles once in awhile. oh and the EGR and charcoal canister are I do have a short somewhere in the dome light and horn/ciggy lighter power circuit I have not found yet too, not sure if that is contributing.
I have a couple winaldl logs could someone check them out? I have searched and read for days but really have not found enough data to know what I am looking at. Can't seem to attach the logs?
Thanks
Tim
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