Trouble idiling

[obster]

Hello

I have a problem with my rev2 tubby, it does not want to idle at all! Basically it starts perfectly fine and runs at about 1200rpm for about 3-5seconds and then just dies, as if the fuel has been cut or something. If you try to keep it alive by reving it it just splutters and misfires for a short time and then dies.

I have checked compression which was fine as expected seeming as it starts fine and runs well for aprox 3-5 secs. then i disconnected the fuel return pipe and had someone start it for me, i had a steady flow of fuel right up to the point it died, so it wasnt like the fuel stopped flowing before it cut out.

I noticed that when i done a compression test all the spark plugs were cocked up so it seems as if it is running too rich. I checked the resistance in the airflow meter using the manual i have and noticed that one of my readings was around 1000 ohms when it should be between 200-600 ohms, however if this was at fault i would expect a fault code for it?

I have checked for fault codes but i just get a steady flashing of the engine managment light so no codes in memory, i have tried resetting the ECU but still no joy.

This all started just after fitted a rev3 turbo and MLS headgasket along with a manual boost controller, which was set to 1bar. I went for a test drive and it was boosting well, then as i pulled into my road it died and then the problem started.

I dont know if it could be related but before all this happend and before turbo was fitted, when the engine got nice and warm it would idle around 750rpm and fluctuate a little, almost like it was going to stall!

Im not sure what to check next so any ideas would be great.
Hopefully someone can offer advise

Thanks

[h20490]

My mate has the same problem on his MR2! his is a rev 3 and it only started acting funny as he was driving it home.

Does it tend to sound like it wants to come into boost or that boost is always on dispite it misfire/bucking?

did you get this resolved? he has only just bought the car and now cant even drive it which is a shame.

I havent had a proper look as I was hungover in it on the way back from Leeds Festival and "couldnt get my act together" was an understatement

any help much appreciated.

Thanks

[h20490]

and i dont think its the turbo/headgasket as nothing has been changed i think GTS CHris used to own the car it was the white one with white lenso wheels.

Like you the car drove fine down the motorway and was boosting great and 30 seconds from the turn off it just misfired and then when we came to a stand still it did what you described.

I havent checked the spark plugs and havent done a compression test yet as I cant get down to view the car for a few days. really need to get it sorted as its his daily drive

Anyone?

[djpkins]

AFM cars are very intollerant of air leaks, I blew a hose off my IC last year and it wouldn't run...started, farted and cut out...chck the oil and water for mixing, sparkies again...but it sounds like A/F to me, and as you've had the pipework off to fit the turbo...it's a good place to start...did you change the igniter?

[2mad]

Hi,

If its not a faulty airflow meter or that the airflow meter screw has been messed with (wound too far out) it sounds like it could be an air/vacuum leak.

You could try looking for an air leak between the airflow meter and turbo, the airflow meter and idle control valve.
Check that all boost hoses are done up nice and tight and that none of them have split.
Next I would look for a vacuum leak. . vacuum hoses, gaskets on the inlet side, the capped off pipes on the back of the inlet manifold, tvis system hoses ect.

Hope you sort it, Good luck

[h20490]

cheers guys!

I cant get down to his till Monday but will deffo check, I did suspect it could be a boost/vac leak (like something might have popped off) as the car travelled from Bournmouth to Blackpool and then blackpool to Leeds fine and then from Leeds to blackpool on the way back it just happeed at the end of the journey.

Ive not owned an AFM car but I assume it will located nearest to the air filter? are they easier to clean or repair?

Thanks again guys

[djpkins]

Prob not the actual AFM, but once the afm has measured the air going through it, it will fuel accordingly...hence the overfuelling and misfire when all the air falls out...you can bet that it'll be the hardest joint to get to, just be methodical and bear in mind old silicone can de-laminate and it may not be obvious, also double check the vac lines and and t-pieces you may have spliced in there.

[h20490]

Right finally had a look at the car. (rev 3 turbo)

The car wouldnt run properly and the idle would cut out and sound quite lumpy. This was solved by disconnecting the HKS FCON PRO and plugging in the OEM ECU however...

The car still seems hesitant during boost I have inspected the silcone joints and hav efound a coulpe do seem to have wear although not cracked/split yet.

There is one on the Apexi air filter/pipework that does have a black grommet which is used to block off part of the Apexi filter kit which has split which could effect it however I ver much doubt it.

Im still convinced its a boost leak somewhere Im just really struggling to locate it. did the ghetto washing up liquid test but couldnt find much.

Cant find anyone to Smoke test the car, its been to two garages (1st garage didnt want to touch it 2nd garage sorted the idle out but nothing else.)

Im sure GTS chris also didnt know there was a HKS FCON Pro either as he didnt mention it on the for sale thread either nor did he say anything about this.

Did the OP get his fixed?