ozhummer
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aw11 sc fuel or ignition cut out
i have just taken delivery of a aw11 sc as a project. it has a problem that i want some diagnostic help on. what happens is under acceleration in 1st and 2nd it pulls very hard then cuts fuel or ignition without warning!! almost like its overboosting and just running protection by turning off the fun!! its running an after market pully system and pushing 11psi. has anyone else had this and know what it is and how to fix it????
post edited by ozhummer - 2011/07/02 21:24:22
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sweeetpete
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Re:aw11 sc fuel or ignition cut out
2011/07/03 06:46:41
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Cant help you but try on toymods forum also in AW11 anonymous a lot of good AW info there.
2001 spoida black, remus exhaust C one spoiler Carbing braces. 01spoida red track car turbo,omp seats,,cusco clutch/lsd C one strut braces. 89 Aw11Sc.
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Blakely
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Re:aw11 sc fuel or ignition cut out
2011/07/03 12:38:22
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Edit: Sorry, thought this was an older post, looked at the wrong date (joined date, not message date). Please ignore my comment, lol. Did you solve the problem? I have a similar issue in my sw20. Was just going to get it on a dyno for a tuning session
post edited by Blakely - 2011/07/03 20:49:26
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Kookabanus
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Re:aw11 sc fuel or ignition cut out
2011/07/03 17:50:10
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How high up the rev range do you get before it cuts?
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ozhummer
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Re:aw11 sc fuel or ignition cut out
2011/07/07 11:35:06
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It's not consistent - but it is when it's on full boost! ...
One thing is whoever had the car previously modified the SC plumbing - and there is bolt emerging from the top of the Bypass valve thing - not sure why this would have been installed so if anyone can enlighten me, please do so...
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scz
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Re:aw11 sc fuel or ignition cut out
2011/07/07 18:09:14
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It may have been set up to have the 'charger clutched in all the time. In that case, the bolt will be to hold the valve in the 'supercharger' position without defaulting to 'atmospheric' as they normally do when the 'charger clutches out.
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ozhummer
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Re:aw11 sc fuel or ignition cut out
2011/07/07 18:23:11
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That sounds like a bad thing!!!! Should I tke it out??? Does anyone have a BSV for sale????
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ozhummer
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Re:aw11 sc fuel or ignition cut out
2011/07/09 18:06:11
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Happens only once the car has reached full operating temp
Wide Open Throttle - @ about 5500 rpm
1st and 2nd gear
on full boost.
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ozhummer
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Re:aw11 sc fuel or ignition cut out
2011/07/10 18:15:58
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A bit of an update..
I have flushed the coolant and refilled - did all the proper bleeds etc.. I though it may have been an air bubble against the temp sensor causing the computer do do funny things.
It actually happens at low revs - about 2500 upward it happens - not totally under WOT but it's much worse if it is WOT.
Compression tested today - all 4 are 140PSI so very happy with that...
The ABV installed is an after market one... not sure of any other details, but it has a bolt in the end with a lock nut that I presume is uses to control the bypass pressure ???? If anyone can assist with more info that would be good...
Thanks
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MCT_MR2
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Re:aw11 sc fuel or ignition cut out
2011/07/10 20:59:13
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Sounds like a cusco ABV. They were essentially modified standard ones with the bolt to adjust the preload, without having to bypass the vsv's on the system as done in the conventional abv mod. Nothing wrong with these.
'88 MR2 4AGTE W/ EFR6258 224.6KW @ 20PSI more to come......
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Cubits
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Re:aw11 sc fuel or ignition cut out
2011/07/11 02:39:13
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Yeah, the new ABV is for the handling bigger pulley without doing a "dodgy" bypass job. :p I've never felt it kicking in as i've never gone past 8psi on the stock unit, so i can't tell you if it's the ABV activating too low, but something must be responding to either the boost, or knock (caused by the jump in intake charge temps), and reigning everything in. It's hard to diagnose without having a poke around. Does it happen after a couple of seconds of WOT when the engine is warm, or instantly? If it's after a few seconds i would suspect the knock sensor is seeing something. If it takes a much longer time when the engine is cold, i would say it's definitely the intake temps or a faulty knock sensor (have to check the temps). Is the SC good on oil level? If it's the instant the boost peaks, then it's boost cut (wind the abv up a bit). When i have some free time i'd be happy to come and check it out. I'd like to see what 11psi would be like in my car. ;D
post edited by Cubits - 2011/07/11 02:42:38
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ozhummer
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Re:aw11 sc fuel or ignition cut out
2011/07/12 08:28:37
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I have spoken with Terry from Road & Track who believes this issue could be fuel related. So I set about last night to see if there are any obvious faults in that area. Here are my findings:
I attached a lead and LED to the FP connection in the Diag box. When the FP is on it lights up. This was done to check the switch in the AFM was working correctly. The led illuminated as soon as the engine started to crank and did not falter at all – so the FP and AFM switch are working.
I replaced all the vacuum hoses and made sure there were no leaks. Still no difference.
I also tried to test the Fuel Pressure regulator and it appeared to be ok (although if anyone knows of an easy way to test the FPR then let me know..)
I’m pretty sure it’s not the knock sensor either .
So I appear to be no closer to finding the cause and solution….
And to answer CUBITS questions, it happens only when warm(ish) - I can drive up our street into 3rd gear - all good, the instance I do a U turn and head home it starts ...
SC Oil is good.
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Xtreme
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Re:aw11 sc fuel or ignition cut out
2011/07/14 14:50:44
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Have you tested the fuel pressure?
Low fuel pressure may cause some of the symptoms that you have mentioned.
eg. faulty fuel pump or partially blocked fuel filter.
I'm not sure about the temperature (warmish part), as driving down the street and up is a very short time, if it was a lengthier drive then I would suggest to have a look at the coolant temperature sensor, you can measure the resistance vs temp and confirm if it working. But I would say check the fuel pressure first.
Regard the ABV, if it's a stock ABV with a bolt on it, it maybe a modification to increase the spring rate to hold the pressure during boost. This is just my thought as I haven't hacked one of the ABV open before.
I guess some photos of your setup and ABV would be good start for others to help!
= )
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MCT_MR2
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Re:aw11 sc fuel or ignition cut out
2011/07/15 07:50:58
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Your ABV looks like this??  That's a cusco one. The other telltail signs are the tops are different, as a stock one has a press bent top. could be fuel / timing related...
'88 MR2 4AGTE W/ EFR6258 224.6KW @ 20PSI more to come......
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ozhummer
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Re:aw11 sc fuel or ignition cut out
2011/07/15 08:00:17
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THATS IT !!!!!! What can you tell me about it ? - How do you adjust it etc ???
I'll throw a new fuel pump and filter in it this weekend and check the fuel pressure too..
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