birchy2010

iTrader: (12)

Guys I'm appealing for advise. Just driving home from wok my car isn't very well. Symptoms are.
High idle - 1500rpm
If lifting off when on boost revs itself about another 500 - 1000 revs
Doesn't self rev if not been on boost.
Revs regardless of in gear or not, clutch pressed or depressed.
Boost falls off as expected. Although flickers on new high idle.

My worry is it's burning oil to rev itself after the presure builds from full throttle.
Anyone got any ideas / thoughts?

giz1978

iTrader: (5)

compresstion test and is the engine breathing heavy???

RS_Matt

One of my cylinders has severe piston ring failure and the car shakes like a bugger on idle due to uneven compression.

birchy2010

iTrader: (12)

Giz what do you mean by breathing heavy? Oil temperature got to past 100 when normally struggles to reach 90 on the same journey. It doesn't shaken at idle but sounds a but tappy slightly which I don't ever recall seeing and vibrates a bit when revved manually on the throttle body.

RS_Matt

Any blue or black smoke when revved hard?

birchy2010

iTrader: (12)

Touch of black.

musso2010

Black indicates fuel. Maybe a dodgy MAF? ive had ring failure before, and the smoke was clearly blue...

birchy2010

iTrader: (12)

Is there's a way of testing the maf by unplugging it or something?

musso2010

Unplugging it is a myth. The only sure way of checking it, apart from replacing with a new one and seeing if your problems go away is to check the MAF voltage with a multimeter.

musso2010

Have also noticed your from Wolverhampton. Me too.

birchy2010

iTrader: (12)

Haha nice to know someone local! I've got a multi meter so can check it. Do you know what conditions I need to check it an what I'd expect to say it's working correctly?

musso2010

Find the pinout at the ECU, shove your test probes into the back of the sensor ground and the MAF sensor signal pins.. Take someone with you to hold/watch the meter and go for a drive. You (or your passenger) should see the voltage fluctuating between around 1 and 5 volts. The more air being taken in, the higher the voltage.

If you accelerate hard, you should see the meter reading rising steadily and consistently. If at any point you see it dropping significantly out of the trend while you are accelerating (so, for example, you see a progression like 3.20/3.30/3.35/2.00/3.50/3.60), and you know you didn't lift off the throttle, this is a warning sign.

Hobstar82

If running on oil you'll get blue smoke outta exhaust. If you got a broken ring you'll feel and see the engine running uneven. From memory think the MAF runs around the 1.2v mark at idle and upto 4.0v WOT under load. You may wanna check for air intake leak

birchy2010

iTrader: (12)

Checked the hoses I can. Can't find my multimeter so going to have to see if I can borrow one tomorrow.