Another 1.8T Hesitation under hard acceleration - MG-Rover.org Forums

 
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post #1 of 14 (permalink) Old 10-05-2010, 00:26 Thread Starter
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Another 1.8T Hesitation under hard acceleration

Hi guys as per title my 1.8T hesitates just as the turbo is kicking in at 3000RPM upon flooring the accelerator mainly in 2nd but also in 3rd gear.

At first I thought it was the common misfire symptoms that everyone else has pointed to. I have checked the turbo pipes all seems fine and I dont think it is the coil packs or spark plugs etc. I wouldn't describe it as a misfire or any kind of electrical fault.

It is definitely more like a very strong hesitation causing the whiplash jerking that others speak of.

I have narrowed the problem down and find it only happens when I accelerate hard with 1/4 of a tank or less of petrol. So my question is do you guys think it is fuel related and do I need to get myself an orange clip on my filter as maybe this is the cause????

This problem ruins what otherwise is an excellent drive when working correctly.

Any help much appreciated
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post #2 of 14 (permalink) Old 10-05-2010, 07:52
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Hi,

It could be the manifold pressure sensor, number 6 on this grid. http://www.rimmerbros.co.uk/Item--i-GRID001691 They sometimes give that sort of problem. Or it could be sucking air in around the throttle body?
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post #3 of 14 (permalink) Old 10-05-2010, 10:19
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Originally Posted by MR (Z)T View Post
do I need to get myself an orange clip on my filter as maybe this is the cause?
A definite yes I'd say. It may or may not not be the current problem, but you will eliminate a major cause of poor fueling.

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post #4 of 14 (permalink) Old 10-05-2010, 11:13 Thread Starter
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Hi,

It could be the manifold pressure sensor, number 6 on this grid. http://www.rimmerbros.co.uk/Item--i-GRID001691 They sometimes give that sort of problem. Or it could be sucking air in around the throttle body?

If these were the problem, wouldnt this happen all the time? and not just when there is little fuel in tank?

Last edited by MR (Z)T; 10-05-2010 at 11:34.
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post #5 of 14 (permalink) Old 10-05-2010, 12:06
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could be the fuel pumps (If it works the same was as the dervs?)
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post #6 of 14 (permalink) Old 10-05-2010, 12:51
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If these were the problem, wouldnt this happen all the time? and not just when there is little fuel in tank?
Possibly. I'm going on what I've read on here in the past. I did read a post that someone had a problem much as you describe, replaced that sensor and it cured it.
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post #7 of 14 (permalink) Old 10-05-2010, 13:46
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Originally Posted by mgnev View Post
Possibly. I'm going on what I've read on here in the past. I did read a post that someone had a problem much as you describe, replaced that sensor and it cured it.
Turbo vac and boost pipe oil swollen and sucking in air almost definately

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post #8 of 14 (permalink) Old 10-05-2010, 13:58 Thread Starter
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Turbo vac and boost pipe oil swollen and sucking in air almost definately
TS would this happen when fuel tank is low only?

Anyone got diagram of the turbo with the pipes labelled?
...and where would one get replacements?
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post #9 of 14 (permalink) Old 10-05-2010, 14:04
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No all the time under load if it's not the filter syndrome, it'll be this it's repairable with a smaller pipe insert or cable tie

TS Autos - I do everything apart from paint and bodywork, I excel in trim, mechanical and electrical faults on all models, but know ZT/75's every nut and bolt quite literally. Please PM me if you need a part or work doing to your car! location as requested Midlands Area DY8 1XQ
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post #10 of 14 (permalink) Old 10-05-2010, 14:08 Thread Starter
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No all the time under load if it's not the filter syndrome, it'll be this it's repairable with a smaller pipe insert or cable tie

Ok will try both, just got to figure where to put the cable tie(s)...
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post #11 of 14 (permalink) Old 10-05-2010, 15:49
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See the post boost problem on this page it shows the pipes I'm talking about

TS Autos - I do everything apart from paint and bodywork, I excel in trim, mechanical and electrical faults on all models, but know ZT/75's every nut and bolt quite literally. Please PM me if you need a part or work doing to your car! location as requested Midlands Area DY8 1XQ
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post #12 of 14 (permalink) Old 10-05-2010, 21:52 Thread Starter
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Originally Posted by ts autos View Post
See the post boost problem on this page it shows the pipes I'm talking about

Thanks TS do you mean this thread
1.8T 75 Estate - boost issues ?

If so whats the best position to sort the white pipe on the wastegate and should i need to remove anything?
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post #13 of 14 (permalink) Old 06-11-2014, 17:32
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1.8t Engine Picture

Would someone be able to do me a massive favour. I need a picture of a 1.8t Engine bay. Recently had the engine replaced but not able to find out where one of the vac pipes from the turbo goes.
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post #14 of 14 (permalink) Old 06-11-2014, 19:41
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Does this help?

In this image, 'pipe' means both pipes.






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