1994 Chevy Blazer cuts off

Tiny
DEBJOHNSTON
  • MEMBER
  • 1994 CHEVROLET BLAZER
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 19,700 MILES
Started off months ago hard to crank, turn over strong, sometimes would start on first try. Ck. Injectors & found leakage in supply lines, replaced. Ck fuel pump good pressure, chg fuel filter and before finding fuel leak had tune up. Also before finding fuel leak had the ignition mod. Rep. What now? Now nothing different still turns over strong, if and when it does crank it will just cut off. I let it idle before going anywhere and it idled real smooth for 10 min. Just cut off. No skipping just as if I turned the key off. My son wants to replace complete harness, except I think it could be relay or is there a fuse that hasn't been ck. Being a female my opinion is not appreciated. I said it wasn't fuel pump and it wasn't.I said injectors, which was leaking so now I say its getting fuel but not enough voltage to or not getting the message to run!He scanned & it said map sensor, HELLO? Could this be the problem? He doesn't think so.
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Wednesday, April 21st, 2010 AT 2:06 PM

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Tiny
INTERNETMECHANIC
  • MEMBER
I'm just double checking, is 94 s10 blazer, four cylinder?
If it cranks good, but won't start, have a helper crank it, while you visually check for spark at the plugs. To check for spark, use a known good spark plug or spark tester, pull spark plug wire, stick tester in the boot, ground metal part of tester to metal part of engine, watch for spark. If you have spark everywhere, use a gage and check fuel pressure. Even if the parts are new, I'd still want to check pressure. Some of the national brand autostores used to loan out a fuel pressure gage, if you don't have one.

Any applicable trouble codes? You should be able to check for mil codes yourself. To check for codes, you use a jumper wire between the A & B terminals of the datalink connector. Turn the key, just till the dash lites come on, no further, the mil starts flashing, you count the flashes to get the codes, your looking for two digit codes. Each codes will flash three times before moving to next code, if there is one. It should flash a code 12 anyway, that is one flash, a slight pause, then 2 quick flashes, the code will flash three times.


http://www.2carpros.com/forum/automotive_pictures/512072_94_s10_blazer_1.jpg

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Wednesday, April 21st, 2010 AT 3:14 PM
Tiny
DEBJOHNSTON
  • MEMBER
Yes Vortec 4.3
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Wednesday, April 21st, 2010 AT 3:44 PM
Tiny
DEBJOHNSTON
  • MEMBER
I'm getting a 34 code
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Wednesday, April 21st, 2010 AT 4:10 PM
Tiny
INTERNETMECHANIC
  • MEMBER
Hi Deb, thanks for the donation. The 4.3 is a 6 cylinder, The code 34 is map sensor, low voltage. I can't say that the sensor is faulty, that might be an old code. I'd have to check the sensor circuits at the sensor wiring connector, check vacuum, also.
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Wednesday, April 21st, 2010 AT 4:40 PM

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