Hot Starting Trouble
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Freshman User
Joined: Nov 2005
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Hot Starting Trouble
Here is my problem. I went to get gas this morning, and the bronco was cold, and it fired right up as it always does (1500 rpm when cold, then 750 after warm.) After filling up, I went to start her up, and she started, but when it caught it idled at 400-450rpm and then went up to 750. Then I came home, it sat for an hour, and when I tried to start it back up, it turned over but didn't catch. On the second try it caught, but I cranked it for longer than usual and it again did the low idle. Its an 89 302 EFI AOD, freshly tuned, new motorcraft o2 and TPS, just cleaned the IAC, and I got 15.06 mpg ( all highway ) on the fillup. Any ideas or is this normal.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
Check teh ECT sensor resistance if there is nothing obvious. The sensor can fail but not send voltage to the computer that is read as "out of range" so it will not trigger a fault code. I've posted the resistance based on temperature before but am without my cross-reference info at the moment... not at home.
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Freshman User
Joined: Nov 2005
Posts: 36
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Forgot to mention the ECT sensor was also replaced at the same time as the o2 and the TPS. Drove 35 miles on the freeway today, stopped in a parking lot, and when I restarted the engine, it turned over slow but it fired pretty quickly and on the first try. I am stumped.
