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ladsm.com :: View topic - Cant figure out the problem...
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Cant figure out the problem...
http://ladsm.com/forum/viewtopic.php?f=5&t=11501		 Page 1 of 2
Author:  BikeDemon [ Sat Jun 26, 2010 5:55 pm ]
Post subject:  Cant figure out the problem...
I have a 420 A engine on my 98, and I was told that injector 3 and 4 are low in power, could that be the problem that is making my car turn off after 13 minutes..?
Author:  christ [ Sat Jun 26, 2010 6:13 pm ]
Post subject:  Re: Cant figure out the problem...
Injectors either work or they don't. Who told you that and how did that come to that conclusion.
Author:  amskater [ Sat Jun 26, 2010 6:19 pm ]
Post subject:  Re: Cant figure out the problem...
is the check engine light on?
Author:  BikeDemon [ Sat Jun 26, 2010 9:47 pm ]
Post subject:  Re: Cant figure out the problem...
no check engine light is on, and the mechanic that my pops hired said that, cause he the pressure on I dont know what and said that the normal pressure is 160 and the last 2 were only doing 120..
Author:  christ [ Sat Jun 26, 2010 11:20 pm ]
Post subject:  Re: Cant figure out the problem...
Are you sure he's not talking about a compression test on the cylinders?
Author:  Illeagle [ Sun Jun 27, 2010 2:16 am ]
Post subject:  Re: Cant figure out the problem...
Im thinking compression too. But that 120 isnt going to make a car stop running.
Author:  gordonbradford [ Sun Jun 27, 2010 11:47 am ]
Post subject:  Re: Cant figure out the problem...
I pulled the compression numbers from my factory service manual for you. For the 420a standard compression should be between 170-225 service limit is 100. Maximum allowed difference between cylinders is 25%. 25% of 160 is 40. Which means your motor is at the maximum allowed pressure difference. So technically your compression numbers are within factory spec. So imo compression isn't your issue and your mechanic just wants to make some money off an engine rebuild/swap.

edit: heres a photo of what the manual says so you can show the mechanic.

Image
Author:  BikeDemon [ Sun Jun 27, 2010 1:10 pm ]
Post subject:  Re: Cant figure out the problem...
well, if you guys think that cant be the problem for turning off my car, then what might be, any ideas?
Author:  Illeagle [ Sun Jun 27, 2010 1:37 pm ]
Post subject:  Re: Cant figure out the problem...
what does it do when it dies? strait turn off like you took the key out or bog down and die?
Author:  BikeDemon [ Sun Jun 27, 2010 10:30 pm ]
Post subject:  Re: Cant figure out the problem...
well, it doesnt turn off like when I take off the key, it just shakes a lot and bogs down and dies, if I attempt to turn on the car again, it will only turn on if I step on the gas, as soon as I let go, then it bogs down and dies and it also sounds weird when i pressure it into turning it on, kinda sounds like an STi...
Author:  amskater [ Sun Jun 27, 2010 10:57 pm ]
Post subject:  Re: Cant figure out the problem...
sounds like you need a new coil pack, and possible your fuel filter could be getting clogged too
Author:  clockworktoy [ Sun Jun 27, 2010 11:08 pm ]
Post subject:  Re: Cant figure out the problem...
Sounds like it only initially turns on because of the car being in open loop while warm up, and once it reaches operating temp and goes into closed loop the car turns off because of either too much fuel or not enough.
Author:  Illeagle [ Mon Jun 28, 2010 1:07 am ]
Post subject:  Re: Cant figure out the problem...
sounds like a dead o2 sensor stuck at a low/high voltage
Author:  BikeDemon [ Mon Jun 28, 2010 12:25 pm ]
Post subject:  Re: Cant figure out the problem...
Sic, im gonna check that out, thanks!
Author:  ToxicRacing [ Tue Jul 27, 2010 9:30 pm ]
Post subject:  Re: Cant figure out the problem...
while your at it cheek your idle control valve...
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