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Author Topic: car hesitates when given throttle  (Read 3200 times)

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dave abra

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car hesitates when given throttle
« on: 16 May 2010, 13:06:10 »
Hello

You guys have been really helpful over the years but i wonder if you can give some suggestions this time

My 2.5 V6 98 omega hesitates when given some throttle. Doesn't do it some much when the car is cold. It does do it mostly when leaving a roundabout, so i have some speed but getting more speed is an issue. rev counter goes up and down when accelerating.

I have already changed the following.
ICV is new.
MAF is new.
EGR is replaced but not brand new. This improved things but not a cure.

Any thoughts on what might still be the issue would be great.

Thanks
David
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Welung666

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Re: car hesitates when given throttle
« Reply #1 on: 16 May 2010, 14:34:00 »
Have you checked for any fault codes?
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dave abra

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Re: car hesitates when given throttle
« Reply #2 on: 16 May 2010, 15:19:11 »
yeah.
just did paper clip test and got number 31 No rpm signal

What does that suggest?
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eliteomegaman

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Re: car hesitates when given throttle
« Reply #3 on: 16 May 2010, 15:28:17 »
Code 31 will show on the V6 when the ignition is on BUT the engine isnt started. Once u fire up the car the code will disappear  :y
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dave abra

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Re: car hesitates when given throttle
« Reply #4 on: 16 May 2010, 16:01:04 »
oh yeah. i remember reading that somewhere.

no other codes then at the moment.

Any ideas what it might be
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eliteomegaman

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Re: car hesitates when given throttle
« Reply #5 on: 16 May 2010, 16:13:37 »
Havn't got the faintest idea  :-/ but as mines running rough i look forward to one of the experts to come back to u  :y
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Welung666

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Re: car hesitates when given throttle
« Reply #6 on: 16 May 2010, 16:44:22 »
Pul a plug lead from each bank and check for oil in the wells.
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dave abra

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Re: car hesitates when given throttle
« Reply #7 on: 16 May 2010, 18:09:36 »
Thats already been checked. The plugs are good and it runns as sweet as a whistle. apart from the hesitating
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Zuffenhausen

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Re: car hesitates when given throttle
« Reply #8 on: 16 May 2010, 18:45:54 »
Plug leads ?
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dave abra

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Re: car hesitates when given throttle
« Reply #9 on: 16 May 2010, 19:00:03 »
I believe they are good. Garage said they are ok. will have a look myself.

Any other ideas? while i am there
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dave abra

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Re: car hesitates when given throttle
« Reply #10 on: 10 June 2010, 20:49:59 »
Hello

I still am having issues with my V6 hesitating. Have read a few other posts on vauxhall forums, not specific to omega's, that coil packs or a dodgy injector could be the source of my problems.

Do omega's suffer the same issues as 1.6 astra's? in this area?
Please help. it is driving me bonkers.
Cheers
David
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davethediver

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Re: car hesitates when given throttle
« Reply #11 on: 10 June 2010, 21:14:58 »
if it was coil pack i would have thought it would show up a misfire code and been more noticeable :-/
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dave abra

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Re: car hesitates when given throttle
« Reply #12 on: 10 June 2010, 21:18:12 »
Would disconnecting the EGR have any effect. I read somewhere that if i do that the ECU would need an update from a tech 2.

Is that right.
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tidla

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Re: car hesitates when given throttle
« Reply #13 on: 10 June 2010, 22:40:28 »
air leaks? you have no fault codes, better when cold.
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dave abra

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Re: car hesitates when given throttle
« Reply #14 on: 11 June 2010, 20:53:30 »
A little better when cold. not always though.

have checked air pipes. well the ones i can see anyway. Are there any well hidden i should know about.
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