Ok, since putting some fuel cleaner in the car has been hesitant and intermittantly stuttery (as if a spark plug is breaking down) I have now flushed the cleaner out with 2 lots tanks fills 2x£50)
car still stutters and now brings up code 52 (here we fing go again.)
check the timing and its set on 10 degrees. Charge cooler fine, water pump fine. I disconnected the knock input to ecu and fed a signal to simulate normal knock signal and went for a drive. Car knocks on medium accelaration.

Any ideas what this could be? If its engine out or head off then car goes to the highest bidder. Simple!

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St205 WRC - Running sweet.

I presume you are feeding the car on Shell V Power Nitro? Last time this happened on your car the symptoms disappeared when you filled up with Shell 99.

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Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

esso 97, (which is what I feed it 99% of the time) as shell garage is too far away

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St205 WRC - Running sweet.

The car will knock without the sensor wired to the ecu. The stock maps are just above the threshold. In normal learnt mode the ecu has always some knock retard applied. So lying to the ecu, it will see a valid knock sensor, provining its seeing a semi valid looking level of out it will assume no knock and slowly let it go the the mapped extreme.

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Darryl

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Darryl

Also, its been high ambient temp wise, so I'd deffo expect the knock to be higher than normal. And so the ecu will pull a bit of timing to stop it.

--
Darryl

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Darryl

ok, so any ideas what the problem is? I did this before and did not get the above symptoms... yes, temps are higher hence i've set timing at 10 degress.
I can not get normal power without it coughing all the time...

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St205 WRC - Running sweet.

actually, I don't think Im getting det. The couching noise is coming from the exhaust, I think that I just have a duff knock sensor as well as the coughing noise fault whatever that is...
Spark plugs are NGK copper, bought about 2 months ago.

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St205 WRC - Running sweet.

tried replacing dizzy cap, rotor then leads.

dizzy cap and rotor, less than a year old, not done leads...
I don't want to replace things for the hell of it, I might have a word with nibbles and see if I can borrow these items to pinpoint which part on my car has broken down..

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St205 WRC - Running sweet.

I ran a jdm 205 on 95 Ron an fudged knock sensor input for ages with no det.

I take it it runs smoothly with simulated knock sensor, just pinking ?

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If at first you don't suck seed, try drier grain.

No, it runs as it did before (cr@p) but not as bad. Also, I don't think its pinks at all, with or without knock sensor or simulated knock sensor, hence why I think there are 2 faults. Fault 1 being a broken knock sensor (code 52)
Fault 2 - Over to you guys....
What I though was pinking is short quick coughs out the exhaust....

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St205 WRC - Running sweet.

Sorry, It has always run smoothly, it just doesn't like anything over 40% throttle. That's when I get the slight coughs out the back and lack of power....

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St205 WRC - Running sweet.

I don't know the history of the car but has anyone measured your afr? What caused you to use the injector cleaner?

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JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

Dunno, thought they'd might need a clean.... I do it every year or so....
Never had an issue before..

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St205 WRC - Running sweet.

I think there may be a moral to the story there about don't fix what ain't broke.

Coughing at higher cylinder pressures sounds like weak ignition. Voltage required to ionise gas (mak a spark) goes up with pressure.
If it's a regular misfire (3 cylindering) at higher throttle may indicate plug, plug lead or dizzy cap.
If it's random could be dizzy cap, rotor arm, king lead, coil or igniter.

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If at first you don't suck seed, try drier grain.