Acceleration hesitantion
21 October 2018 | 08:37 PM
#1
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From: Swindon
Acceleration hesitantion
2008 Hatch STI.
in all modes between 2500rpm-3750rpm the car has started hesitating under acceleration if you just feather the throttle it’s very jumpy and bumpy until 4K then it’s fine plus really smoothly. It use to pull so smooth all the way through the Rev range now it’s very irratic through low revs. No fault codes I’ve had the intercooler off all the hoses look ok and checked for dirt on the Maf that looks fine, any suggestions?
in all modes between 2500rpm-3750rpm the car has started hesitating under acceleration if you just feather the throttle it’s very jumpy and bumpy until 4K then it’s fine plus really smoothly. It use to pull so smooth all the way through the Rev range now it’s very irratic through low revs. No fault codes I’ve had the intercooler off all the hoses look ok and checked for dirt on the Maf that looks fine, any suggestions?
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21 October 2018 | 11:32 PM
#10
Replacing the fpr and dampers didn't correct my stumble, but as Charlie says, it generally doesn't just pop up as an issue from nowhere. Have you had any map changes and/or added any performance mods?
22 October 2018 | 07:47 AM
#11
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From: Swindon
It has a Andy forest remap on it but it’s always had that, I haven’t changed anything physically, it happened while driving at the Nurburgring I used the 102ron fuel they have out there and that seemed to trigger it, i don’t understand how that could effect it but apparently on some threads I’ve read it is a possible cause. Is a remap now necessary??
22 October 2018 | 10:42 AM
#14
if you have a OBD-II ELM reader and something like Torque App you can do it that way without losing any radio stations. handy to have as well should any engine lights come on, they only cost about £10-15 to buy
it will not affect the map in any way.
22 October 2018 | 11:22 AM
#15
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From: Swindon
Sweet my friend has a couple of very good ODB readers the proper laptop industry type with full work shop manual information associated so hopefully his will do the trick or disconnect the battery over night will do the same thing? I will return once done
23 October 2018 | 09:24 PM
#17
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From: Swindon
Just thought I’d put a conclusion, carried out the ecu reset and low and behold it cured the GR stumble. Thanks for advice, I genuinely can’t believe putting the wrong ron fuel in could be such a problem
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