I have a 92 petrol L300 and for the past month the idle has been acting very strange. At start-up sometimes the idel is fine and will work fine the whole time. Other times at start-up the rpms will be very low (200 rpms) it will suddenly rev up to about 1500 rpms and drop back to 200 and stay that way the rest of the drive. Also when I turn on the air-con (push the A/C button) the rpms drop very low and the entire engine shakes like it is going to stall.
Can anyone help me!
Crazy Idle *Petrol Version
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rhdpanda
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Green1
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Re: Crazy Idle *Petrol Version
now I don't know the petrol version specifically, however on the diesel version there is a link from the A/C to increase the idle whenever the A/C is on (this stops your revs from dropping when the A/C kicks in) I suspect that this is very similar on the petrol version and is likely the piece malfunctioning in some way as it does have control to raise the revs up to the 1500rpm range when the A/C is on.
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impalator
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Re: Crazy Idle *Petrol Version
I have a Diesel Delica - so what I am writing here may just serve as a generalized suggestion... but it may still be a possible answer to your issues.
Once I had a Dodge Colt (same thing as Mitsubishi Colt but sold under license by Mopar) - it was a 1.5L 4 cyl gas engine. Whenever I took the Colt in for a tune-up the idle would afterwards be completely screwed up... sometimes idle at 1'500 rpm... sometimes idle very low at 400 or less... it took usually about 3-4 weeks of normal driving usage until the idle was back together again (at around 600 or 700 rpm)... at one point I made a comment about this erradic behaviour to a mechanic and I was told the following:
The lambda / injection / catalytic converter set-up in these kind of engines was as such, that when the battery got disconnected (for example during a tune-up or when some electrical work was done) the computer module managing the fuel/air/injection ratio essentially "forgot" all its learnings and had to re-program itself over the course of the driving once reconnected. As a result, the fuel/air ratio and subsequently the exhaust gas/oxygen ratio was screwed up and resulted in the injection module "trying" to correct the error and idling once higher, once lower until it had its "history" together again...
If you recently had your battery disconnected, this may be the issue... if it's not, maybe your oxygen-sensor (Lambda-sensor) in the exhaust pipe (I am assuming its Electronic Fuel Injection with a Catalytic converter you are driving) is broken?
Anyway... good luck...
Cheers,
Chris
Once I had a Dodge Colt (same thing as Mitsubishi Colt but sold under license by Mopar) - it was a 1.5L 4 cyl gas engine. Whenever I took the Colt in for a tune-up the idle would afterwards be completely screwed up... sometimes idle at 1'500 rpm... sometimes idle very low at 400 or less... it took usually about 3-4 weeks of normal driving usage until the idle was back together again (at around 600 or 700 rpm)... at one point I made a comment about this erradic behaviour to a mechanic and I was told the following:
The lambda / injection / catalytic converter set-up in these kind of engines was as such, that when the battery got disconnected (for example during a tune-up or when some electrical work was done) the computer module managing the fuel/air/injection ratio essentially "forgot" all its learnings and had to re-program itself over the course of the driving once reconnected. As a result, the fuel/air ratio and subsequently the exhaust gas/oxygen ratio was screwed up and resulted in the injection module "trying" to correct the error and idling once higher, once lower until it had its "history" together again...
If you recently had your battery disconnected, this may be the issue... if it's not, maybe your oxygen-sensor (Lambda-sensor) in the exhaust pipe (I am assuming its Electronic Fuel Injection with a Catalytic converter you are driving) is broken?
Anyway... good luck...
Cheers,
Chris
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thedjjack
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Re: Crazy Idle *Petrol Version
sounds like a sensor problem.
I would figure out what cars your motor came in a go to owner sites for that car.
Each fuel injection system is different and pre-OBDII (1996 I think) computer hook up for diagnostics are different.
My jeep use to have a servo that speed up the idle when cold or the AC was on. It went crazy and I unplugged it. On very cold days (-20) I would have to hold the idle up for the first few minutes, but problem free everywhere else.
The AC problem just sounds like the computer cannot adjust the idle for the increased load. Look at what stops the throttle (idle point), if it is a electronic motor I would guess it is that motor (either what controls it or the motor).
that is my guess
I would figure out what cars your motor came in a go to owner sites for that car.
Each fuel injection system is different and pre-OBDII (1996 I think) computer hook up for diagnostics are different.
My jeep use to have a servo that speed up the idle when cold or the AC was on. It went crazy and I unplugged it. On very cold days (-20) I would have to hold the idle up for the first few minutes, but problem free everywhere else.
The AC problem just sounds like the computer cannot adjust the idle for the increased load. Look at what stops the throttle (idle point), if it is a electronic motor I would guess it is that motor (either what controls it or the motor).
that is my guess