Posted: 7/11/2008 9:21:13 PM EDT
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99 300m Background, got hot when the cooling fans went out on july 2. She pulled into a parking lot asap but I dont know how hot it got. Wouldn't restart when I got there. Would turnover and fire on a couple cylinders but wouldn't even get close to an idle. Went inside and ate dinner, came out and it started, idled rough and the check engine light came on. Cleared up and had been fine ever since, new fans and fuses. CEL went out the next day. Flash forward to today. Stomped on it on the freeway to get around traffic because the exit was coming up. Downshifted and revved up to 5500 and stayed there, had to back off so it would shift. On the exit ramp it stalled and would not restart. Same symptoms as when it got hot on july 2 except no CEL. Will start now, but will not idle. Everytime the idle drops to about 500 rpm, the oil light comes on and it dies, it will stay running if you open the throttle but it is running rough. |
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Check the IACV (Idle Air Control Valve) for fouling. It should be right at the throttle body. Spray some brake cleaner on the butterfly and around in the throttle body. Do it slowly and with the car hot but not running. wait 10min before restarting. Unhook battery for 30 min to let the computer reset. Replace the Throttle Position Sensor (cheap). Get a couple cans of Mopar Combustion Chamber Cleaner and follow the directions. It's nothing major or your Check Engine Light would still be on. People complain about new cars and computers... but the damn things nearly diagnose themselves. In fact, hold off on the TPS until last. If it was bad, you should get code P0122 or P0123. If you don't have a code scanner, limp it over to Autozone. They scan it free. CEL must be lit up for them to check it. |
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I had a similar situation. After I burned my truck up, then repaired it all, only to still have the same problem, I found I had a broken valve spring. Go pick up a compression tester at Autozone/Checker/Whatever and check #2. If you've got good compression (~150psi) then its time to start looking elsewhere. If you have low or no compression, pull the valve cover and have a looksie.. rr |
my crown vic with clogged cats acted like it was slipping in the transmission when i tried to pass people, etc. it will definitely rev to 5500 with no resistance (ie: accelerating as fast as it revs) "Stomped on it on the freeway to get around traffic because the exit was coming up. Downshifted and revved up to 5500 and stayed there, had to back off so it would shift. On the exit ramp it stalled and would not restart. Same symptoms as when it got hot on july 2 except no CEL. Will start now, but will not idle." exactly what my car did, minus restarting. edit again: could be some of the things above that burned in the cylinders that didn't belong, then eventually clogged the cats. so probably more than one simple fix here. |
yep folks New Yorker did exactly the same thing with a cloged cat no power and would barely idle but you could rev the shit out of it in park |