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ECU or TPS? 200 1986

posted by  dcooledge on  Tue Mar 4 19:58 CST 2014
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last visit: Tue Sep 9 07:48 CST 2014
[RELATED]

So I'm at my wits end with this car. The backstory is that it sat for 5-6 years, and I've replaced just about everything related to the fuel system: tank, both pumps, filters, injectors, fpr, return line, amm, iac, ect. The problem seems to happen only when it is cold: tonight, when I started it after sitting about 5 hours in 30-degree weather, it started right up, but I couldn't get over 60mph on the freeway, and would downshift whenever I tried to accelerate. I pulled off the road, turned it off, and turned it back on. This time, it would rev higher, but "coughed" under load (no backfiring). So I pulled off again, turned it off, counted to 10, and started it up. This time it ran perfectly. I know 86s had issues with cold starts. I checked the records I got from the original owner and didn't see anything about recall work being done. The only sensors that haven't been replaced are the oxygen sensor (which I have tested) and the TPS. The issue seems to be non-idle related. Is it possible that the TPS is sending a intermittently-bad signal to the computer?

I do have an '88 240, which is also LH 2.2, and I'm thinking of swapping the ECU.

Any ideas?

Dean






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