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DISCUSSION => Engine + Driveline => Topic started by: RED IS 91 on February 10, 2007, 11:53:57 AM

Title: hesitation
Post by: RED IS 91 on February 10, 2007, 11:53:57 AM
What would cause a stutter in acceleration around 4K rpms.It doesn't matter what gear I'm in the car starts hesitating at or around 4K  when I'm accelerating.Runs perfect up to 4K.
I was thinking MAF but would like some feedback .
Title: hesitation
Post by: romkasponka on February 10, 2007, 12:02:18 PM
It could be O2 sensor, check fault codes..
Title: hesitation
Post by: RED IS 91 on February 10, 2007, 05:00:43 PM
new O2 ,crankshaft sensor,tps ,plugs ,wires ,coolant temp sensor,radiator ,thermostat.
Title: hesitation
Post by: asubimmer on February 10, 2007, 05:32:51 PM
deff sounds like a crank sensor, thats what mine did.  I would check it even if you replaced it.
Title: hesitation
Post by: RED IS 91 on February 10, 2007, 07:41:43 PM
Quote from: asubimmer;19249
deff sounds like a crank sensor, thats what mine did.  I would check it even if you replaced it.


I've checked it .I don't even think the one I replaced had anything wrong with it .
Title: hesitation
Post by: doigal on February 10, 2007, 08:15:04 PM
Check for exhaust and air inlet leaks as well.
Title: hesitation
Post by: RED IS 91 on February 12, 2007, 04:02:54 PM
Well come to find out it was the spark plugs .I ordered a set of NGK BKR6EK .
What a difference they made . The champions I had in there looked good .
I had Bosch in there before them .It was my last ditch effort before looking into another MAF.
No hesitation now at all around 4K rpms . :D :D
Title: hesitation
Post by: doucy2 on February 12, 2007, 05:27:46 PM
my o2 makes mine do that. replacing it this week, so we'll see.
Title: hesitation
Post by: RED IS 91 on February 12, 2007, 06:34:56 PM
Quote from: doucy2;19370
my o2 makes mine do that. replacing it this week, so we'll see.


Good luck
Are you selling your car ??
I thought I saw it on another forum for sale ????
Title: hesitation
Post by: Febi Guibo on February 12, 2007, 08:14:23 PM
on an vaguely unrelated note, we should pool our money for a club-owned "known good working AFM" unit to help resolve our various issues.

Still hesitating at 4k rpms?
Title: hesitation
Post by: RED IS 91 on February 13, 2007, 10:59:34 AM
Quote from: Febi Guibo;19382
on an vaguely unrelated note, we should pool our money for a club-owned "known good working AFM" unit to help resolve our various issues.

Still hesitating at 4k rpms?



That's a good idea about the AFM.Whenever my car is not running smoothly I think of the AFM but if you don't buy a new one then your taking the chance of getting one that is just as bad as the one you've got or worse yet ,buy one and install it but it doesn't solve the issue.
You could test it and it still be screwed because of the variables of the "barn" door testing method.
As far as my dilemma it turned out to be the spark plugs as I said in the previous post above .I was getting ready to do a AFM swap but thought I'd take one last stab with new plugs .
Who would think that a hesitation at 4K throughout the gears would be plugs .
All indications of that would point me to the AFM as I've replaced all the other sensors already .
I am glad this is not my daily driver .It's a hobby car which I like to work on and I will slowly bring it back to grandeur .We all know that we'll never get the money out that we put in .It is so much fun to drive though.When you get it up to 4 and 5k it sounds so good and performs great.
Sorry for the looong post but I really like my car.