Lumpy idle and tffft tfffft noise
12-16-2005, 11:34 AM
#1
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Join Date: Oct 2005
Location: UK
Posts: 26
Hi guys, Ive just loaded a new map onto my pfc from this website http://opus.bloomcounty.org/~patrick/pfc/ and took the car for a couple of runs. I was watching my knock sensor and it didnt seem to go over about 50ish I know they arnt very accurate but thats all i`ve got at the moment. When I got back from the second run the car wouldnt idle very well. It would go up and down between 700 - 800rpm and trying to stall and there was a tffft tfffft tffft sort of noise coming from the engine. When I raise the revs a bit the noise speeds up then goes away at about 1500rpm. My vacuum reading is a bit low ie 300 instead of 500 so maybe I`ve got a leak? all the hoses have just been replaced and it was fine when I took it out before the drive and there are no boost issues.
any ideas?
any ideas?
12-16-2005, 11:43 AM
#4
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that'd be my bet. Check around for obvious loose hoses, especially at the MAP sensor. I think a compression test is gonna tell you that you popped the engine however.
12-17-2005, 02:44 AM
#6
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Join Date: Oct 2005
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Without the map, I was getting a huge reading on the knock sensor when I drove it and it felt crap after the map it was under 40/50 on the knock sensor and drove fine, I still didnt push at all.
I`ve gotta wait till next week before I get a compression tester but I`ve had a listen with the screwdriver technique. I placed the screwdriver in between the plugs. The front rotor just makes a whuring noise the rear rotor has a slight metalic ting so I guess its blown.
But hey nevermind I was going to rebuild next year anyway.
I`ve gotta wait till next week before I get a compression tester but I`ve had a listen with the screwdriver technique. I placed the screwdriver in between the plugs. The front rotor just makes a whuring noise the rear rotor has a slight metalic ting so I guess its blown.
But hey nevermind I was going to rebuild next year anyway.
12-17-2005, 10:54 AM
#7
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Originally Posted by benRX7' post='787484' date='Dec 17 2005, 04:44 AM
I`ve had a listen with the screwdriver technique. I placed the screwdriver in between the plugs. The front rotor just makes a whuring noise the rear rotor has a slight metalic ting so I guess its blown.
Huh?
