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post #1 of 10 Old 05-28-2008, 09:14 PM Thread Starter
Elihawk
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Another acceleration issue...

When my 08 Compass is cold, my gas pedal has a lag...to shift, I let up on the gas and then the clutch, but when cold the rpms surge even when my foot is off the gas, just for a split second. After I have driven for a 8-10 blocks, this problem goes away. Anyone else have this? Thoughts from you mechanics?

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post #2 of 10 Old 05-29-2008, 07:14 PM
Gramps
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You're the first with that one on reporting it. Not a clue!

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post #3 of 10 Old 05-29-2008, 07:22 PM
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These engines seem to have a certain lag to them at all times, but especially when cold. I notice it on my 2,4L Caliber when cold, you rev the gas and it takes a sec for the RPMs to drop. (Mine don't go up as it is a CVT one) It also does it on the highways, I saw a comment from an SRT4 owner lamenting this as well, but I don't remember why he was...

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post #4 of 10 Old 06-08-2008, 09:16 AM
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lag when cold????

Thats new to me, my 08 rallye with the manual acts like a race car when its cold, but after it warms up the motor lag is very bad no power until 4 thou RPM,s.
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post #5 of 10 Old 06-08-2008, 09:33 AM
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I notice if I don't let my Pat warm up, when I attempt to drive off, it "hiccups" for lack of a better word - lag in response that I'd have to give a significant amount of gas to overcome. I have to push in the clutch, give it a little more gas, then try again. It only happens once, and by the time I'm at the end of my street (1/8 mile), it doesn't happen again. My husband's does the same thing. Thought it was a Patriot thing...

Funny thing-I used my A/C for the first time since buying the vehicle. It seems to shift better than with it off- funny since every other vehicle I've had seems to lag down the engine with the A/C on. Peculiar but not bad-
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post #6 of 10 Old 06-08-2008, 09:49 AM
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I had the same singe hiccup before I had the Performance TSB done that applies to April '07 build dates and before, no problems since then. They may come out with another TSB to fix yours.

The new A/C units on the MKs draw very little hp and the electronics are programmed to up the idle speed when it's turned on.

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post #7 of 10 Old 06-08-2008, 11:54 AM
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That's the exact thing that happens with my mazda pickup truck. Only when it's cold. When I start the engine, it idles a bit low, I tap the gas, and it surges even when I release the gas pedal. After I go a bit down the road, it doesn't do that anymore.

In the summer time, it NEVER happens. Figured it was normal, and never had a problem with the truck.
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post #8 of 10 Old 06-09-2008, 04:43 AM
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Quote:
Originally Posted by Gramps View Post
I had the same singe hiccup before I had the Performance TSB done that applies to April '07 build dates and before, no problems since then. They may come out with another TSB to fix yours.

The new A/C units on the MKs draw very little hp and the electronics are programmed to up the idle speed when it's turned on.
Interesting-thanks!
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post #9 of 10 Old 06-09-2008, 09:01 PM Thread Starter
Elihawk
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Guys, I have had the hiccup...but not so much since it is not longer cold outside. The RPMs rev/lag I still get. I really thought that I had just forgotten the clutch/accelerator foot-timming, but I recently drove my freind's 5 spd truck like a horse at the preakness. Anyway, especially out of first gear I get a rpm surge AFTER I let up on the accelerator and release the clutch...especialy for the first couple miles I drive. Once the engine is warm, not so much...
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post #10 of 10 Old 06-10-2008, 05:34 AM
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Eli, this may not be a TSB issue but that doesn't mean that your pcm couldn't stand to be flashed. It's just another computer and we all know that they get a bug or wrong code in them some how. MANY of the early Calibers had to have their pcm's flashed/replaced so I would take it to the dealer and see if they could take a look at yours.

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