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MR2 Turbo runs rough when warm and cuts out
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TOPIC: MR2 Turbo runs rough when warm and cuts out
#75124
MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 1
Hi all.
I'm new on here and looking for a bit of help.
My turbo has been layer up over winter and now I'm having problems.
When I first start it up it runs OK with the slight odd miss. However when it gets to about a third on the temp gauge it runs lumpy and cuts out. Any ideas? ECU temp sensor and AFM test OK against bgb.
Thanks

Rob
mr2mk2
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#75130
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 42
Might need fresh petrol. Can make a huge difference. Just throw in a few liters of good Stuff and see if that does the trick
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#75138
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 1
Tried that but no difference.I think the last time I used it at the.end of November it cut out as I stopped on the drive and wouldn't recommend start. I didn't plan on using it for a while so thought I would sort it out in the Spring. Apart from that it drove fine.
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#75140
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 42
Sorry then .I don't like electric stuff or more like it doesn't like me
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#75142
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 72
When it cuts out are you able to start it or do you have to wait till she cools down again?
spla300
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#75166
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 1
Have to wait until it's completely cold. So I was thinking ecu temp sensor but that checks out ok against the bgb. Cold start switch is disconnected and the Afm tests OK against the bgb. Also I have bridged the contacts so the fuel pump runs all the time. Ideally need to try and drive it but no most at the moment so can't do that.
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#75170
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 72
This happened to me when i put 650cc injectors into mine which require a different pulse.
Your injectors arent firing for the correct duration, im guessing its your injector pack, if thats what you call it..
its just up over your coil pack, there should be 2 aluminium heatsink looking things screwed together, one is for injectors the other is for the fuel pump.
spla300
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#75174
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 1
Did yours start bogging down as though it was running on one cylinder before it died? I noticed the front heating was getting warm. Is that the injector pack?
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#75176
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 1
Sorry heatsink (my phone keeps changing my words!!)
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#75178
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 72
Yeah mine ran like a pig when it got warm and i had to keep reving it to keep her running and if i let her cut out there was no starting once she cooled down, in my case it was uprated injectors which didnt match the pulse from the stock injector pack and i never got an error code.
Your injectors are stock which leads me to believe your injector pack isnt sending the injectors the correct signal, take it out, clean up the contacts, look for corrosion, if it dosent help try borrow one from someone else to test.
Is your engine rev2 or 3?
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#75188
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 1
spla300 wrote:
Yeah mine ran like a pig when it got warm and i had to keep reving it to keep her running and if i let her cut out there was no starting once she cooled down, in my case it was uprated injectors which didnt match the pulse from the stock injector pack and i never got an error code.


Your injectors are stock which leads me to believe your injector pack isnt sending the injectors the correct signal, take it out, clean up the contacts, look for corrosion, if it dosent help try borrow one from someone else to test.
Is your engine rev2 or 3?


It's a rev1. I checked the resistor pack and they all measure at just over 6 ohm. I wonder if they can break down with heat?
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#75190
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 1
I meant to ask, was yours OK when you changed it or did you have to do some mods?
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#75196
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 72
I put in the 650cc injectors without upgrading anything else so the pulse was wrong, i just put the stock 540cc ones back in and everything was fine.
mine is a rev3.

Have you done anything with the car at all while she was standing up?
spla300
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Last Edit: 2015/06/04 22:57 By spla300.
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#75224
Re: MR2 Turbo runs rough when warm and cuts out 4 Years, 6 Months ago Karma: 137
Moisture may have got inside the distributor cap. Check it for corrosion and give it a clean or replace if it looks suspect.
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