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Stumble from stop light under mid to heavy throttle Stumble from stop light under mid to heavy throttle
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  #11  
Old 04-07-2022, 09:35 PM
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I'd take another look at the ICV, even though you cleaned it 20k miles ago. Easy to check and to clean. I think it would provide the symptoms you're seeing. And it could be that your cleaning did not get all the gunk.
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  #12  
Old 04-08-2022, 10:34 AM
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i should clarify, it is bogging down when tapping the throttle for about a sec. Seems to be something at initial throttle / fuel to air ratio? will do some tests and see
Tested cold start up, replaced the air filter and does not bog down. Will test with it warm and then run those tests, thanks!
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Last edited by ewebby; 04-08-2022 at 11:10 AM.
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Old 04-08-2022, 11:04 AM
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Find live data for the pedal sensor and TPS. If you can, graph :

Both pedal sensors
Both TPS

High TPS & high PS
Low TPS & low PS

If there is a dead spot on one of the sensors it will show up there.

I would measure fuel pressure
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Old 04-08-2022, 03:31 PM
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I replaced the air filter, so far so good, will give it additional driving. 16k on air filter in Arizona, dirty but seen worse.
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Old 04-10-2022, 12:27 PM
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was 1/2 quart low on transmission fluid, so far so good. Added while running and will continue to test.
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  #16  
Old 04-11-2022, 12:13 PM
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keep getting p1247 - cyl 3 misfire. swapped coils with 1 and 3. no oil in plug. Pulled plug and looks fine. test drive provided no issues. continuing testing.
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Old 04-11-2022, 01:20 PM
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Quote:
Originally Posted by ewebby View Post
was 1/2 quart low on transmission fluid, so far so good. Added while running and will continue to test.
top up while running and cold
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Old 04-11-2022, 02:37 PM
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Transmission spec to fill at a precise temperature like 30-50c.
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Old 04-11-2022, 02:39 PM
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is there a lifespan of coils? Mine are original, 260k Bremi 2001
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Old 04-11-2022, 02:58 PM
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Stumble from stop light under mid to heavy throttle
Quote:
Originally Posted by ewebby View Post
is there a lifespan of coils? Mine are original, 260k Bremi 2001

Ohh…. Swap those Bremi’s out with the Bosch. The Bremi’s were known to have issues. Mine started acting up around 74,000 miles.

I’ve also been told, to check the Bosch mfg. dates. There were some issues there as well.

MAF, DISA, Vac lines, and O2’s also help cure that stumble. It will never totally go away though, I think it is a characteristic of the M54.
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