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 Post subject: Hesitation and Smoke
PostPosted: Sat Aug 06, 2005 4:16 pm 
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Joined: Sat Aug 06, 2005 3:58 pm
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When I floor the CRD to pass from highway speeds, I get a 3-4 second delay before the transmission downshifts. There appears to be no acceleration until the downshift. When the downshift occurs, there is a significant amount of soot coming out of the exhaust (enough that people behind me back off). Jeep runs great otherwise, and mileage is very good. I have successfully used the "smokem out" technique for tailgaters, but wonder if perhaps the PCM programming for downshift or perhaps the throttle position sensor is screwy. Anybody else experiencing this?


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 Post subject:
PostPosted: Sat Aug 06, 2005 9:30 pm 
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Location: Telford, Pa.
Go find a parking lot some where and from a dead stop floor it. Do you still get that 3-4 second delay???

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 Post subject:
PostPosted: Sat Aug 06, 2005 9:48 pm 
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Depends on the "highway speed." The turbo kicks in at ~1800 rpm, which is about 55 MPH. Anything below 1800 rpm and you're just experiencing turbo lag.

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 Post subject:
PostPosted: Sun Aug 07, 2005 12:56 am 
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From a stop or even from 50 mph if you floor it it accelerates smartly. It's the lane change from 65-70mph where this happens. It's not turbo lag; engine is at 2,000 rpm so boost should not be an issue. It's like the PCM is taking its good old time telling the tranny to downshift.


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 Post subject: Same soot
PostPosted: Sat Aug 20, 2005 8:28 am 
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Joined: Sun Jul 31, 2005 6:50 am
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Location: Meadville,Pa
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I had the same soot thing last night. I was on the interstate with a slow gasser in front of me. When I floored it to pass a large cloud of black soot came billowing out! It looked like an old war movie with the smoke screen. My speed at acceleration was 60mph.

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 Post subject:
PostPosted: Sat Aug 20, 2005 1:37 pm 
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Location: Vincennes,IN
Hmm never had to floor mine , I just let the boost come up and let it stay in high gear seems to pull speed really good just like that. I try to keep it under 2800rpm because anything higher than that seem like a waste, basicly just using the torques sweet spot.

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