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Registered User
Join Date: Mar 2011
Posts: 4
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Lean - only when warm
I have an 88 Turbo. It is quite modified, and has an AF meter in it. When cold, it runs fine (perhaps slight idle hunt). But once it warms up, the ratio skyrockets to 20 or more and the car wants to die at idle. I can use gas to keep it alive to some degree, but it still sputters and barely runs.
Now, when this is happening if I disconnect the TPS the computer decides to run it rich, and all of a sudden it is fine. (Although I idle at around 10:1 ratio which is clearly too rich). I figured it must be the TPS, so I replaced it to no avail. Now, I understand that after reaching operating temperatures the engine goes into closed loop mode, and it is at that time it begins reading the oxygen sensor, and adjusts fuel mapping according to other sensors as well... might that sensor failing be my issue? (It has a wideband). Basically, what sensors change readings when it reaches operating temperature? I am quite sure it is one of those sensors which is causing the problem. Last edited by Reznor; 06-06-2011 at 07:26 PM.. |
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06-06-2011, 07:21 PM
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Registered
Join Date: Jan 2007
Posts: 2,370
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You have a water temp sensor which is cheap and is located towards the front of the motor. You might want to try to replace that. You could also disconnect your o2 sensor and see how the car acts. I don't believe that the 02 sensor comes into the mix above 4000 rpms anyway. Your car will run rich if it is disconnected but it could give you an idea if it needs replaced. I ran my 89 with o2 sensor disconnected for quite awhile till I replaced it.
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06-10-2011, 10:26 AM
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