Engine hesitates between 3000/4000rpm - Subaru WRX Forum
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post #1 of 17 Old 05-05-2003, 10:32 PM Thread Starter
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Question Engine hesitates between 3000/4000rpm

engine seems to hesitate, not smooth accelaration, 2003 wrx. less than 1000mi. on it. it seems to happen in 3th 0r 4th gear around 3500 to 4000rpm. any ideas?
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post #2 of 17 Old 05-06-2003, 04:55 PM
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The gas in your area sucks and your engine is knocking (willing to bet the house) ...

are you using 93 octane?

Is your car stock?

Where do you live?
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post #3 of 17 Old 05-06-2003, 09:52 PM
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aviation fuel!!!!!! with no cats......funfunfun
you ###### need to adjust your timing and fuel for the altitude youre runnin........utec bound? k is right.......local gas sucks! stock fuel/ign maps suck too......
Joey
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post #4 of 17 Old 05-06-2003, 10:20 PM Thread Starter
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Quote:
Originally posted by Kobiyashi
The gas in your area sucks and your engine is knocking (willing to bet the house) ...

are you using 93 octane?

Is your car stock?

Where do you live?
Grand Rapids, Mi.
Premium Gas 93 octane
brand new, stock
why hesitation only in 3rd gear at around 3500rpm, wouldn't it knock at other gears and different rpm?
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post #5 of 17 Old 05-06-2003, 10:24 PM Thread Starter
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Quote:
Originally posted by fc735
aviation fuel!!!!!! with no cats......funfunfun
you ###### need to adjust your timing and fuel for the altitude youre runnin........utec bound? k is right.......local gas sucks! stock fuel/ign maps suck too......
Joey
it sounds more like a timing/fuel problem, should i have the dealer check maps performance?
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post #6 of 17 Old 05-07-2003, 09:50 AM
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eh...if its new, with no mods...hellz yeah. have it looked at. if youve touched it...they'll void the warr in a heartbeat. poss just need updated reflash....dunno. but i would hav eth edealer look at it....
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post #7 of 17 Old 05-07-2003, 11:07 AM
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Quote:
Originally posted by rjhhockey1


Grand Rapids, Mi.
Premium Gas 93 octane
brand new, stock
why hesitation only in 3rd gear at around 3500rpm, wouldn't it knock at other gears and different rpm?

Only 3rd and up, your boost increases every gear (more pressure), so your boost wouldn't be as high in 1st or 2nd; which means higher temps. Try running better fuel and change to cooler plugs, that will help you out if your car is stock.


Hope this helps.
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post #8 of 17 Old 05-07-2003, 03:12 PM
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My car has done the same thing from new. I also got it form that same dealer in Grand Rapids.
As ive mentioned before, i dont think i trust those guys, go to the Muskegon dealership for all your dealer related stuff.
I bought a set of guages to go in the centre pod where the clock is, and they tried to void my warranty. I went to Muskegon, they are fine with the guages, the white dials and the silencer removal on the intake.
I told them i wanted an exhaust, they said no problem.
They want all the business they can get after buying a huge new building, so they pretty much bend over backwards to help you out.
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post #9 of 17 Old 05-08-2003, 08:41 PM Thread Starter
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Quote:
Originally posted by ScoobySnax
My car has done the same thing from new. I also got it form that same dealer in Grand Rapids.
As ive mentioned before, i dont think i trust those guys, go to the Muskegon dealership for all your dealer related stuff.
I bought a set of guages to go in the centre pod where the clock is, and they tried to void my warranty. I went to Muskegon, they are fine with the guages, the white dials and the silencer removal on the intake.
I told them i wanted an exhaust, they said no problem.
They want all the business they can get after buying a huge new building, so they pretty much bend over backwards to help you out.
What did the dealer in Muskegon, find wrong with your hesitation problem. the dealer in Grand Rapids said they hooked the computer up and drove it and did not find any errors. they said they also did diagnostics on it in the garage and could not find a problem. They say its turbo lag, I know I know the differance between turbo lag and hesitation. Please let me know what the Muskegon Dealer found.
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post #10 of 17 Old 05-08-2003, 09:56 PM
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It's not turbo lag, get you some gauges and look at what happens, I could better help you with those readings... EGT.. A/F.. Boost
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post #11 of 17 Old 05-12-2003, 03:55 PM
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My problem is on a long run, say from GR to Ludington, about 120 miles, i get off the highway, stop at the off ramp, then pull away and the thing is so lumpy, hesitates, and the boost drops again, then picks up. This happens from just above idle to 5500rpm.
I have an auto meter boost guage it works great, very fast response and i can watch the boost rise to 14.5, then back right off to 8-10 psi exactly as the car hesitates. This happens part or full throttle. It then picks up again at around 4000rpm and stays at about 14.5- 14.7 psi.

Engine wise, car is standard apart from intake silencer removal.

Muskegon replaced the BOV and a coil pack. They recommended i put cooler plugs in it but i wasnt to tell them. Told ya they were cool with mods.
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post #12 of 17 Old 05-16-2003, 11:18 PM Thread Starter
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Quote:
Originally posted by ScoobySnax
My problem is on a long run, say from GR to Ludington, about 120 miles, i get off the highway, stop at the off ramp, then pull away and the thing is so lumpy, hesitates, and the boost drops again, then picks up. This happens from just above idle to 5500rpm.
I have an auto meter boost guage it works great, very fast response and i can watch the boost rise to 14.5, then back right off to 8-10 psi exactly as the car hesitates. This happens part or full throttle. It then picks up again at around 4000rpm and stays at about 14.5- 14.7 psi.

Engine wise, car is standard apart from intake silencer removal.

Muskegon replaced the BOV and a coil pack. They recommended i put cooler plugs in it but i wasnt to tell them. Told ya they were cool with mods.
Thanks for advice, I will schedule a service visit with the muskegon dealer, I'll let you know what they find.
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post #13 of 17 Old 05-18-2003, 07:34 PM
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No problem, lets meet up sometime, i drive to GR every day. 81 miles each way. Im foookin dead by friday night.
I think there a few Michigan people on the site now.
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post #14 of 17 Old 05-18-2003, 09:46 PM
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I have the exact same problem with engine hesitation. I don't know if it is the gas in my area or what?? The highest gas I can seem to find is 91 octane. I am not sure if this is the problem, but I am sure that it doesn't help. I have tried octance boosters, and I think they help, but it could be pyschological. I think I will be taking my car to the dealership to make sure everything is ok. It just seems that the engine is not living up to it's full expectations, it feels like something is holding it back.

What is the deal with installing cooler plugs? Could this be a problem. I am soo glad that I am not the only one who has this problem, there must be a common problem, and fortunetly there must be a solution. If we all put our heads together I am sure we can figure this out.

Here are the details of my car:
2002 WRX
42,000 KM or 26,500 Miles
Gas Octane Level = 91
No turbo gauge, but will be getting one soon.
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post #15 of 17 Old 05-20-2003, 06:02 PM
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Cooler plugs allow you to run higher boost if im correct. If not, im sure someone will correct me.
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