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Corvette
C4 Forum
1990 corvette runs rough
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<blockquote data-quote="Darryl L" data-source="post: 116365" data-attributes="member: 3734"><p>Hi! After getting the fans to cycle correctly, it is not a heat related issue. The car runs at normal temp now and the fans working well. I installed a new IAC because of a rough idle. The rough idle issue is fixed as well! Now it starts excellent and runs like new and can even be driven short distances. Lots of power, no smoke, good throttle response, smooth idle at lights. Then all of a sudden, out of the blue, it will stall at low speeds (while slowing down for a light etc) and when restarted will run like it's flooded with black smoke from exhaust (ultra rich). I leave it off a minute or two and it fired up and runs beautiful for another while. This has happened at all points in the start warm operating tep cycle. It seems totally un related to a heat issue or warm up cycle as the car runs normal temp now. In the hunt for a solution, I've checked the EGR, TPS, MAP, IAC, ECM temp sensor, injectors volt spec, fuel pressure, Re calabrated IAC and TPS as per spec, fuel presure regulator, ran all voltage specs, checked for vacuum leaks, broke wires etc... all the basic easy stuff. I think I need to recheck fuel pressure with a newer gauge to be safe as the gauge I used was old and I'm not sure how accurate. I'm down to a evap canister, possibly a O2 sensor (no O2 code though), ECM, possibly ignition module, or?? Kind of a rough problem to solve lol. I will re do many of these tests again just to be safe and not miss anything. I'm not a great mechanic but can patch up a thing or two on occasion lol! The thing runs so good when it's working correctly! I forgot to mention, it's not just a driving issue it will screw up just idling in the driveway. Sometimes it will idle for a long time before it launches into it flood and die issue</p></blockquote><p></p>
[QUOTE="Darryl L, post: 116365, member: 3734"] Hi! After getting the fans to cycle correctly, it is not a heat related issue. The car runs at normal temp now and the fans working well. I installed a new IAC because of a rough idle. The rough idle issue is fixed as well! Now it starts excellent and runs like new and can even be driven short distances. Lots of power, no smoke, good throttle response, smooth idle at lights. Then all of a sudden, out of the blue, it will stall at low speeds (while slowing down for a light etc) and when restarted will run like it's flooded with black smoke from exhaust (ultra rich). I leave it off a minute or two and it fired up and runs beautiful for another while. This has happened at all points in the start warm operating tep cycle. It seems totally un related to a heat issue or warm up cycle as the car runs normal temp now. In the hunt for a solution, I've checked the EGR, TPS, MAP, IAC, ECM temp sensor, injectors volt spec, fuel pressure, Re calabrated IAC and TPS as per spec, fuel presure regulator, ran all voltage specs, checked for vacuum leaks, broke wires etc... all the basic easy stuff. I think I need to recheck fuel pressure with a newer gauge to be safe as the gauge I used was old and I'm not sure how accurate. I'm down to a evap canister, possibly a O2 sensor (no O2 code though), ECM, possibly ignition module, or?? Kind of a rough problem to solve lol. I will re do many of these tests again just to be safe and not miss anything. I'm not a great mechanic but can patch up a thing or two on occasion lol! The thing runs so good when it's working correctly! I forgot to mention, it's not just a driving issue it will screw up just idling in the driveway. Sometimes it will idle for a long time before it launches into it flood and die issue [/QUOTE]
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Corvette
C4 Forum
1990 corvette runs rough
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