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post #1 of 9 (permalink) Old 10-31-2009, 07:46 PM Thread Starter
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Idle Surge at Cold Start

When the temperature is at 40 or lower my 01 Intrepid 2.7 surges to 1,500 rpm at cold start. If temperature is at 30 or lower, the engine will surge up to 2,000 or higher. Engine comes right back down to normal but that initial surge is terrible on a cold engine. Normal startup RPM is 1,100 when temp is above 40. This occurred last winter as well and now that cold weather is approaching the idle is high again. Warm or hot start is fine. Everything else is fine with the drivability and fuel mileage. Any ideas? Thanks
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post #2 of 9 (permalink) Old 11-01-2009, 12:53 AM
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A pretty common occurence. Relatively normal. Its worse in 98-01 cars. Both of mine do it, the trep not nearly as much due to the newer wiring.

Last edited by Daytrepper; 11-01-2009 at 08:49 AM.
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post #3 of 9 (permalink) Old 11-01-2009, 08:45 AM
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Quote:
Originally Posted by brownsChristine View Post
When the temperature is at 40 or lower my 01 Intrepid 2.7 surges to 1,500 rpm at cold start. If temperature is at 30 or lower, the engine will surge up to 2,000 or higher. Engine comes right back down to normal but that initial surge is terrible on a cold engine. Normal startup RPM is 1,100 when temp is above 40. This occurred last winter as well and now that cold weather is approaching the idle is high again. Warm or hot start is fine. Everything else is fine with the drivability and fuel mileage. Any ideas? Thanks
My '01 does about the same thing and always has.
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post #4 of 9 (permalink) Old 11-01-2009, 11:51 AM
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My '98 has been doing this since I swapped in the new ECM.
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post #5 of 9 (permalink) Old 11-01-2009, 11:56 AM
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...and it does it everytime. Even when it's 90 out lately.
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post #6 of 9 (permalink) Old 11-01-2009, 07:38 PM
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Umm... the engine is supposed to rev a little higher during a cold start, decreasing as it warms up... although 2000 RPM is extremely excessive. When it's really cold out (I'm talking -30 degrees Celsius lol) my engine would rev maybe what... 1200 RPM and then, after a few minutes, drop off to below 1000 RPM, which is when I slowly start crawling out of the driveway haha.
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post #7 of 9 (permalink) Old 11-02-2009, 04:04 AM
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Quote:
Originally Posted by brownsChristine View Post
When the temperature is at 40 or lower my 01 Intrepid 2.7 surges to 1,500 rpm at cold start. If temperature is at 30 or lower, the engine will surge up to 2,000 or higher. Engine comes right back down to normal but that initial surge is terrible on a cold engine. Normal startup RPM is 1,100 when temp is above 40. This occurred last winter as well and now that cold weather is approaching the idle is high again. Warm or hot start is fine. Everything else is fine with the drivability and fuel mileage. Any ideas? Thanks
I wouldn't obsess. My 1st and 2nd gen both jump to about 1200 upon start. What you really have to worry about is when it jumps and doesn't come back down. My 1st gen jumped to 2000 and didn't come back down. Thank the head gasket for that. I could get to about 30mph without touching the gas.Much fun backing out of the driveway.
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post #8 of 9 (permalink) Old 11-02-2009, 09:47 AM
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I don't mean to hijack, but reading this really concerns me. Every morning when I start my car the first time, it nearly stalls and I have to hit the gas so the engine will rev high enough to remain steady. Is this bad, bad? =S (Mine's a 3.2l)
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post #9 of 9 (permalink) Old 11-02-2009, 10:39 AM
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Originally Posted by wizwaz3 View Post
I don't mean to hijack, but reading this really concerns me. Every morning when I start my car the first time, it nearly stalls and I have to hit the gas so the engine will rev high enough to remain steady. Is this bad, bad? =S (Mine's a 3.2l)
I THINK it's the electronic fuel ignition system that purposely revs the car up on cold starts. Maybe yours isn't working properly? Can someone provide a more technical explanation to what I'm saying haha?
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