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Thread: Engine surge/flat spot 2k-3k rpm
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08-21-2009, 12:51 PM #1
- Join Date
- Apr 2008
- Location
- San Carlos, Ca
- Posts
- 11
navy blue metalic- 199 Firehawk
Engine surge/flat spot 2k-3k rpm
My '99 Firehawk, with 130K miles, has developed a "stumble", "flat spot" in the 2k-3k rpm range during moderate acceleration. My plugs and wires were changed at 100K miles, the OBD is not registering any codes. When not under load I cannot hear or feel this, but it is quite noticeable when the engine is under moderate load. Where should I be looking?
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08-21-2009, 01:40 PM #2
I would change the fuel filter and clean the MAF.
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08-22-2009, 11:33 AM #3
i have the same flat spot but mine is under normal acceleration, it picks up speed like normal then a big sudden loss of horse power, i wrote about it in a new thread in the "general info" its called "don't run like she used to", maybe you can some clues there and if you find something out please pass the info along in my thread
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08-22-2009, 06:56 PM #4
I see more and more failed MAFs every week.. They don't code either they just report crazy low airflow values and the car wants to run way lean. They all have very high + long term trims values.
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08-23-2009, 10:14 AM #5
- Join Date
- Apr 2008
- Location
- San Carlos, Ca
- Posts
- 11
navy blue metalic- 199 Firehawk
Surge/loss of power
I recently cleaned the MAF.
If it is the MAF, any way to diagnose it?
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08-23-2009, 10:35 AM #6
Check your other posting about the MAF checking.
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08-23-2009, 05:55 PM #7
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08-27-2009, 06:06 AM #8
- Join Date
- Oct 2005
- Location
- Schenectady, NY
- Age
- 62
- Posts
- 7
Red- 1999 Camaro Z28
Surge/flat spot fixed
I have had this problem for quite a while. Cleaned MAF serveral times, new plugs, wires, o2 sensors. Still there. Just for the hell of it I replaced the throttle position sensor since it is only $40 and WOW what a difference. Smooth as butter going up and down through the rpms range.
Try it!
99 Camaro Z28 107,000 miles.
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08-28-2009, 01:58 PM #9
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08-28-2009, 03:54 PM #10
If you unplug it, drive the car EASY. There will be no enrichment available for moderate to heavy throttle. I'm not sure this could prove whether or not one is bad though...
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08-28-2009, 04:33 PM #11
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08-28-2009, 05:29 PM #12
- Join Date
- May 2009
- Location
- Toronto
- Posts
- 1,083
SOM- 2002 SS
can the tps be cleaned?
i started a post titled hesitation under load'. sounds afwully similar to my symptoms.
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08-28-2009, 06:01 PM #13
- Join Date
- Oct 2005
- Location
- Schenectady, NY
- Age
- 62
- Posts
- 7
Red- 1999 Camaro Z28
I first took mine apart to look at it to see if if needed cleaning. It looked ok but I cleaned it anyway with electrical cleaner. Be very careful with the metal fingers that press along the barrel. It isn't one metal finger but lots of very, very fine strands and they are easily bent and ruined. After I cleaned mine and put it back together it ran the same. I'd say don't waste your time. It is too easy to ruin it and it probably needs to be replaced anyway.
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08-28-2009, 07:23 PM #14
- Join Date
- May 2009
- Location
- Toronto
- Posts
- 1,083
SOM- 2002 SS
The suggesion of a bad tps does make sense thinking about my cars symptoms. Under different throttle openings the timing would be drastically different. Interesting... going to see how much one is tomorrow and try to swap it with the fuel filter at once.
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08-28-2009, 08:13 PM #15
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08-28-2009, 08:37 PM #16
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08-29-2009, 11:56 AM #17
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