Multiple Problems.. new info.. 85
Le Mans Master
Joined: Feb 2005
Posts: 6,478
Likes: 565
From: Clearwater Florida
crap
A friend recently replaced his distributor cap & rotor with an Accel unit and afterward his car ran like crap too.....cap replacement obviously involved moving the coil from old cap to new.....it took a while but he eventually discovered that one of the coil mounting screws had penetrated the top of the cap and offered a path of least resistance for the spark directly to the screw and to the coil frame whenever the rotor was under the crack in the cap......look closely at everything !!!!
Thread Starter
Intermediate
Joined: Sep 2007
Posts: 43
Likes: 0
From: Scottsboro AL
I do not have a compression gauge so I am trying to find TDC using my finger... 
I have read that you will feel a "sucking" when TDC is reached....I have rotated the engine a few times and I either feel air pushing on my finger or nothing...can someone tell me the correct way to find TDC ?
I have read that you will feel a "sucking" when TDC is reached....I have rotated the engine a few times and I either feel air pushing on my finger or nothing...can someone tell me the correct way to find TDC ?
Team Owner
Joined: Jan 2003
Posts: 20,304
Likes: 240
From: Summerland B.C. Canada
Put your finger in #1 hole
Have some one jog the starter until you feel air pushing your finger out.
Manually turn motor till balancer and timing tab point to 6 BTDC
Check under cap to see if rotor is pointing to #1
Have some one jog the starter until you feel air pushing your finger out.
Manually turn motor till balancer and timing tab point to 6 BTDC
Check under cap to see if rotor is pointing to #1
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Team Owner
Joined: Jan 2003
Posts: 20,304
Likes: 240
From: Summerland B.C. Canada
Sounds like you got it right in post 48. Did you jog the motor till you felt your finger get pushed out and then turn balancer till it lined up to TDC ??
Thread Starter
Intermediate
Joined: Sep 2007
Posts: 43
Likes: 0
From: Scottsboro AL
I manually turned the engine with a socket and breaker bar...I turned it til the moment the pushing stopped...then backed the engine up a hair...then checked the rotor and it was pointing to number one...then checked the balancer and it was at Zero...didnt make any changes...just lined up that way.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Yeah, forget the compression guage....but get yourself a FUEL PRESSURE guage, about $35. at AutoZone,with it you can eliminate leaky injectors or a fuel pressure regulator, very easy to test, we can walk you through it after you get the guage! You should also spend 20-$25. on a Digital voltage ohm meter, we can help you use it for checking the injector ohms. Your plugs and cat are telling you that you're dumping fuel (flooding the engine). IF you do this we can help narrow it down. The other things that can cause flooding are vacumn leaks, bad 02 sensor or ECM. Timing sounds close enough!
Thread Starter
Intermediate
Joined: Sep 2007
Posts: 43
Likes: 0
From: Scottsboro AL
already bought the compression guage...it was only $6 so no big deal...I already have a digital voltmeter...I will have to check into getting a fuel pressure guage.
I am thinking about bitting the bullet and buying a new ECM...its only $80...think its a good idea or not ??
I am thinking about bitting the bullet and buying a new ECM...its only $80...think its a good idea or not ??
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Trouble shooting is a science and it's best to test things rather than throw money at it. The tools we need for these cars are the DVOM (you have that) timing light, FUEL PRESSURE guage (an absolute) a noid light is very nice to check for injector pulses, and a compression guage (you have that) a vacumn guage is nice too. The FP guage will either confirm or eliminate alot of problems...and you've certainly confirmed you're dumping fuel. It could very well be a bad ECM, but if you're keeping the car the guage is a must have and will definetly save you money down the road. BTW, you may want to check your oil to see if it's contaminated with fuel, should be able to smell it.
Thread Starter
Intermediate
Joined: Sep 2007
Posts: 43
Likes: 0
From: Scottsboro AL
Dumb question...I was browsing around for a guage and saw a few that say Fuel injection test kit...is that wayt I am looking for?
I found one that said Fuel pump\vacuum tester...and another that said..Fuel injection pump tester ...
Thanks in advance.
I found one that said Fuel pump\vacuum tester...and another that said..Fuel injection pump tester ...
Thanks in advance.
Last edited by blkrx8; Jun 11, 2008 at 01:00 PM.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Bought mine at AutoZone, says fuel pressure test kit. It has the guage, with a rubber hose and a valve on the end.....the valve is kinda like a tire pump valve, this connects to the schrader valve on your vet fuel rail (passenger side rear) looks like a tire valve. There's also a clear tube with the guage, it's for bleed off.
Thread Starter
Intermediate
Joined: Sep 2007
Posts: 43
Likes: 0
From: Scottsboro AL
I replaced the ECM ...the original unit only had one PROM chip in it but two slots....The car didnt run any better so I took it to the GM dealer to have it scanned...they said the computer tells them MISSING EPROM and will not continue....they checked and GM does not make those chips any more....Does anyone know where I can find one? I checked with Hypertech and they say their chip is only replacing the larger of the two...Thats not the one I need.... Please help.....
Drifting
Joined: Nov 2005
Posts: 1,361
Likes: 0
From: Downriver Mi.
I replaced the ECM ...the original unit only had one PROM chip in it but two slots....The car didnt run any better so I took it to the GM dealer to have it scanned...they said the computer tells them MISSING EPROM and will not continue....they checked and GM does not make those chips any more....Does anyone know where I can find one? I checked with Hypertech and they say their chip is only replacing the larger of the two...Thats not the one I need.... Please help.....