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Jmbcar33

Altezza Misfire Problem! Please Help!

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Hi everyone,

I am having a serious misfire problem with my 1999 Toyota Altezza with automatic (tiptronic) transmission and 3S-GE Beams engine.

I have already spent a hell of a lot of money trying to fix this problem.

My problem:

My Altezza misfires badly below 3300rpm. The worst misfiring is between 2500 and 3300 but it seems to clear and pull like normal above 3300rpm. It's not like engine is on 3 cylinders, it seems to just be misfiring across all cylinders!

The is no engine warning light on the dash, however the green ECT PWR light flashes - and has been doing so for a long time.

The car does not appear to have any engine error codes stored when I short the terminals togther in the Diagnostics Box in the engine bay, however it does have a transmission error code 76.

I have already fitted the following brand new items to try to fix this problem:

New ECU

New Plugs

New Coil Packs

New Fuel Filter

New Oxygen (Lambda) Sensors

If anyone has any suggestions as to what part to change next, or what could be causing this then please let me know! I was going to try to get hold of a throttle body with electrical components next and try swapping that over...

Thanks,

Jon

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Hi everyone,

I am having a serious misfire problem with my 1999 Toyota Altezza with automatic (tiptronic) transmission and 3S-GE Beams engine.

I have already spent a hell of a lot of money trying to fix this problem.

My problem:

My Altezza misfires badly below 3300rpm. The worst misfiring is between 2500 and 3300 but it seems to clear and pull like normal above 3300rpm. It's not like engine is on 3 cylinders, it seems to just be misfiring across all cylinders!

The is no engine warning light on the dash, however the green ECT PWR light flashes - and has been doing so for a long time.

The car does not appear to have any engine error codes stored when I short the terminals togther in the Diagnostics Box in the engine bay, however it does have a transmission error code 76.

I have already fitted the following brand new items to try to fix this problem:

New ECU

New Plugs

New Coil Packs

New Fuel Filter

New Oxygen (Lambda) Sensors

If anyone has any suggestions as to what part to change next, or what could be causing this then please let me know! I was going to try to get hold of a throttle body with electrical components next and try swapping that over...

Thanks,

Jon

Faulty MAF sensor?

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Are you sure that its a missfire and not the autobox changing between gears eraticly as you have a transmission fault code??? May be you should try to find out what fault code is for autobox first! if you have no other fault codes.

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No, its a misfire.

When sat with the car parked it misfires, as it does when actually driving. It failed the MOT because of ridiculously high emissions from the misfire as well.

I have tried researching the autobox fault code but cannot get hold of the autobox codes for the Altezza. If anyone has them or can point me in the right direction then please do so!

I tried calling the my friends at the local Lexus/Toyota garage to see what the IS200 autobox code 76 was - and it does not even have code 76 listed! The closest number they had was a 74 or 78, cant remember exactly, but that was for the Linear Solenoid.

I personally can't see how the autobox error code and the misfire can be linked, I think they are two seperate problems.

Any idea how or why a faulty MAF sensor would be causing the misfire?

Thanks,

Jon

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Ok if its a missfire on idel then it cant be that hard to find have you had compressions tested ???? or possable pluse to injector or even injector ????

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No, its a misfire.

When sat with the car parked it misfires, as it does when actually driving. It failed the MOT because of ridiculously high emissions from the misfire as well.

I have tried researching the autobox fault code but cannot get hold of the autobox codes for the Altezza. If anyone has them or can point me in the right direction then please do so!

I tried calling the my friends at the local Lexus/Toyota garage to see what the IS200 autobox code 76 was - and it does not even have code 76 listed! The closest number they had was a 74 or 78, cant remember exactly, but that was for the Linear Solenoid.

I personally can't see how the autobox error code and the misfire can be linked, I think they are two seperate problems.

Any idea how or why a faulty MAF sensor would be causing the misfire?

Thanks,

Jon

As far as i know the Maf sensor monitors the amount of air coming into the engine and the temperature of the air, could be totally broken so the ecu doesnt know what to do . Not sure if this causes misfire. maybe take it out and give it a clean with electrical contact cleaner

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Hi again your MAF will not make missfire it will be down to compression,spark or fuel? unless you have air leak from inlet manifold

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faulty maf sensor would bring up an engine management light and code

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If you are misfiring this is normally a fuelling problem, looks like you replaced everything but the air flow meter.

I had an error flash up on my Altezza and the fuel consumption dropped. I took it to a local performance specialist in Southampton and they spent a week going through everything and came up with the air flow meter or something like that - the thing that regulates the flow of fuel depending on how much air has been requested by the throttle. They did explain it to me but I am a numpty when it come to these things. The guy also mentioned that the japanese rarely change their spark plugs as they get rid of the car before they need changing and this is often another fault.

Cost me about £100 and it was all fixed and dandy.

If you want some further info email me on douglas_neal@yahoo.co.uk.

Cheers,

Douglas

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My 1998 alteza is200 is misfiring too I've done the air flow meter all new spark plugs compression test good air filter change full service my misfired on idle and hestitate when first going off from stop running roughly like a sack of spuds still got balls though I got tolded its maybe my fuel injection in cylinder 6 as compression test was fine in al, cylinders but 6 injecter not working 

 

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