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Question

car won't start


Sent to Car Experts September 21, 2006 10:56 p.m.
Hello I am desperately searching for help on input to fix my car. I have a 1993 Buick lesabre. I was having problems with the crank pulley it was very noisy. I replaced with a new pulley from the local automotive very carefully as those fingers are so sensitive. I then put back together and went to start and car fires but does not start. I have since then checked everything that I can and am lost. I have replaced all these parts new crank sensor, cam sensor, computer, electronic thing under coils, checked fuel pressure good spark good has resistor and is good on ignition switch. when it fires it is only for split second. I can spray gas in intake and car will run. Have fuel pressure and when I check injector light flashes for only initial turn of key then nothing. Do you have any suggestions? The only thing I didn't try is the chip in computer. any help would be great.

Optional Information:
1993 Buick Lesabre 3.8

Already Tried:
crank pulley,crank sensor,cam sensor, computer, electronic under coils, fuel, ignition
Customer (name blocked for privacy)
Status: Closed   Value: $9   
Answer
September 22, 2006 5:32 a.m. (6 hours and 35 minutes later) 		REPLIED Check Mark
If your problem is the injecter pulse dropping out, then you need to determine if it's the power side of ther pulse side thsat's dropping out. You could have a short in the power supply side of a bad computer if it's the pulse side.

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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply to Hammer Time
Sent September 22, 2006 8:26 a.m. (2 hours and 54 minutes later)
How do I go about testing this to see what side is bad? Also I replaced computer but have not replaces prom chip. Have prom chip ordered. Need to know how to test this confused.
Thanks,
Scott
Customer (name blocked for privacy)
Answer
September 22, 2006 5:50 p.m. (9 hours and 23 minutes later) 		REPLIED Check Mark

You can use a 12 volt test light to test the power side and if you confirm the power side is OK, then you uses a noid light to check for pulse signal. It gets constant 12V on one side and the computer pulses the ground to operate the injecter but never use a test light on the computer side, just a low impedence noid light. (shown below)

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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply to Hammer Time
Sent September 23, 2006 9:07 a.m. (15 hours and 17 minutes later)
how do I know what side is the hot side and what side not to use test light?
Thanks,
Scott
Customer (name blocked for privacy)
Answer
September 23, 2006 4:36 p.m. (7 hours and 28 minutes later) 		REPLIED Check Mark
You can probe both sides with a grounded test light, just don't power the light to test for ground. If you look at the colors, one color will be on every injecter and that is the power wire.

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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply to Hammer Time
Sent September 24, 2006 10:01 p.m. (1 day and 5 hours later)
I tested the wires today and found that the black wire is hot and the pinkish wire is dead. I tested with noid light and it only flashes when you initally turn on key. Should the noid light be pulseing as the engine tuns over or just the inital??? I am so confused any help will greatly help. I also tried new prom in computer today no luck. Have new throttle postion ordered to try as I have been told that could be cause if a open circut?? is their anything to that??
Thanks,
Scott
Customer (name blocked for privacy)
Answer
September 24, 2006 10:13 p.m. (11 minutes and 57 seconds later) 		REPLIED Check Mark
OK, it appears to be the pulse dropping out. That is the computer's job to do that. You should check all your fuses and any grounds you can find but it seems to be pointing to a bad computer.

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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply to Hammer Time
Sent September 25, 2006 9:10 p.m. (22 hours and 56 minutes later)
checked all fuses and grounds replaced computer when problem first happened to see if that was it because I feel that is what it acted like but still nothing. Was a aftermarket should I buy another to try????? Also replaced prom in computer thought maybe that was bad but still nothing?? How do I go about checking crank sensor wire for continutity and injector wires and also throttle postion wires is their a chance of something being bad with wires? I am so confused why this just after new crank dampner. Did they have any problems with them or crank sensors that you know of???? any help would be great.
Scott
Customer (name blocked for privacy)
Answer
September 25, 2006 9:16 p.m. (5 minutes and 31 seconds later) 		REPLIED Check Mark
Car` won't run with a bad crank sensor. Your problem isolated to the computer or it's imputs.

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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply to Hammer Time
Sent October 02, 2006 10:24 p.m. (7 days and 1 hour later)
Have tried all this still no Luck. Checked all grounds and ran several grounds externallly to be sure working nothing. Tries throttle postion sensor and new prom in computer still nothing. Don't know what to do next so far none of this has helped.
Customer (name blocked for privacy)
Answer
October 03, 2006 5:23 a.m. (6 hours and 58 minutes later)
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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply to Hammer Time
Sent October 03, 2006 3:18 p.m. (9 hours and 55 minutes later)
tried all this still no luck.. Don't know what to try next have replaced all this and nothing checked all grounds and replaced computer again with another one still nothing.
Customer (name blocked for privacy)
Answer
October 03, 2006 5:17 p.m. (1 hour and 59 minutes later) 		REPLIED Check Mark
Your going to need a dealer scan tool at this point. They can access a lot more info than you can. If the securtity system is causing something here, the info will be available to them along with all the other important data.

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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply to Hammer Time
Sent October 03, 2006 5:59 p.m. (42 minutes and 11 seconds later)
Are you suggesting taking the old computer to a dealer to have it read??
Customer (name blocked for privacy)
Answer
October 03, 2006 6:15 p.m. (15 minutes and 32 seconds later)
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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.

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