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Technical Problem again

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Technical Problem again

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death_paladin9

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Feb 2, 2006
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Tipo 1.4ie

Damn now exhaust backfires in (800 RPM) IDLE .Then RPM rises itself up to 2000 in IDLE. I don't know what is the problem again. :cry: Distributor cap was changed 3 monts ago, but the started tuging in IDLE but now, RPM somtimes wont fall down or they are to low. It seems now something realy malfunctioned.. help
 
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death_paladin9 said:
Tipo 1.4ie

Damn now exhaust backfires in (800 RPM) IDLE .Then RPM rises itself up to 2000 in IDLE. I don't know what is the problem again. :cry: Distributor cap was changed 3 monts ago, but the started tuging in IDLE but now, RPM somtimes wont fall down or they are to low. It seems now something realy malfunctioned.. help
Click to expand...

Sure your Timing belt hasn't slipped a few teeth? Has your exhaust got a CAT?
 
Yes, my exhaust has a CAT. As for timing belt, I hope not, on higer rews it runs whitout backfireing. So I sence one sensor has malfunctioned.. any clue ? RPM automaticli goes up to 1500-2000 in IDLE after 30 seconds.. and before that hapens, exhaust backfires
 
I thought backfiring was a result of too much fuel going to the manifold or into the exhaust which has not been burnt yet and the backfire was a result of the petrol blowing up from the heat of the manifold or exhaust.

I asked about the CAT because I thought maybe the CAT component (That long hairy looking thing) might be blocking the exhaust exit.
 
I will have my exhaust checked.. thou today the managment sistem kind of repaired itself, it doesn't rev high in IDLE anymore.. maybe high revs were concequence were because of yesterday, when I unpluged the ECT sensor. I tried to start the car without that sensor, and It didn't start. When I pluged back, the ECUs memory probably had stored that fault in memory till today and raised revs in IDLE. I will investigate further with exhaust check..for unevened IDLEing and probably change ECT sensor, since they are cheap.
 
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Hi there

I went to mechanic and he measured exhaust gases. CO emisions are good, but problem is there is to much oxigen in exhaust between 1300-2000 RPM, and IDELing is aprox. 1000 RPM. In IDLE or very high revs, oxygen level is acceptable. So his conlclusion is, that engine is sucking "extra" air somewhere and mixture is a bit weakened, but it is not so much and you can't hear whispering. Maybe somwhere near intake manifold or the "taflons" must be changed ("taflon" - something, that is instaled where valves are, I dont know the english word for it and don't know how it looks like either).
 
"Taflons" are bearings on the valves and they are made out of rubber. They make sure, that sealing on the valves are good. Could that couse additional air leak to the engine ? What exactly is their purpose ? Should I replace them ? The engine has 145 000 km.
 
You're right. The parts are not expensive, but work alone probably is. The camshaft must be removed so you can access uper side of valves and both sealings replaced (above and below camshaft). I would do this myself, but timing belt must be taken off and I wouldn't wana mess with valve timings. Althou I doubt this will solve the problem, I don't think air is sneaking to the combustion camber to pass by the valves. Or maybe it does. Piston rings shoud be fine I presume, since spark plugs are clean and not oily?
 
The "teflon" is a material for stem oil seals on valves. I think this cannot couse air leaks. My mechanic is probably mistaking. If those were bad, oil would be leaking in the combustion chamber and spark plugs would be oil burned. Also HC emmisions would be high. In my case oxygen level is too high. I think the problem must be to little gassoline sprayed in the intake manifold or vacum is leaking somewhere. Now I must find out way, to determine that leaks. Simply mechanics have just as much clue as I do or maybe less in my case, since I know simptoms of my car. I guess I will have to solve the problem myself. Any clue, how to find a vacuum leakage ?
 
I've started car today and smell gasoline, opened the hood and gasoline was leaking out of fuel suply hose. I think the leaky spot is where suply hose connects to the SPI unit, where the clamps are. I pray to God, that this was causing lean mixture. I will fix it in the morning and see if that is what is cousing poor IDLE and to much O2 in exhaust pipe. I could always smell gasoline near the SPI unit but i've never spotted any leak (and it was hughe, a gasoline flowing on to the intake manifold) , until today. I budget the hose a bit and the leaking stoped. Can this couse low fuel suply to the injector all the time ? Sry if I'm a pain in the ass, but I think you guys can help me on this.
 
death_paladin9 said:
I've started car today and smell gasoline, opened the hood and gasoline was leaking out of fuel suply hose. I think the leaky spot is where suply hose connects to the SPI unit, where the clamps are. I pray to God, that this was causing lean mixture. I will fix it in the morning and see if that is what is cousing poor IDLE and to much O2 in exhaust pipe. I could always smell gasoline near the SPI unit but i've never spotted any leak (and it was hughe, a gasoline flowing on to the intake manifold) , until today. I budget the hose a bit and the leaking stoped. Can this couse low fuel suply to the injector all the time ? Sry if I'm a pain in the ass, but I think you guys can help me on this.
Click to expand...

Yeah I had this problem on me one six, Idle went mad and It would fail to start sometimes and it would love to stall.

Heard the hoses crack all the time, its common. Fix it, its a minor :)
 
Hah, I can't believe it :D :D . I had ruptured pressure hose (the one that comes out pressure regulator into intake manifold). Tipo is running like new, with propper mixture in IDLE. And the "pulling" problem dissapeared.

Thx Transcendental for help

Cheers
 
death_paladin9 said:
Hah, I can't believe it :D :D . I had ruptured pressure hose (the one that comes out pressure regulator into intake manifold). Tipo is running like new, with propper mixture in IDLE. And the "pulling" problem dissapeared.

Thx Transcendental for help

Cheers
Click to expand...

I had a feeling it was the hose when you mentioned it in your last post, same thing happened to me but it was one of the Fuel return from the Fuel Filter.

Good to hear its all nice again :)
 
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