Question about Chevrolet S 10

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Ok i have a 4.3l 1991 chevy blazer when you crank it it idles high for 10 to 15 sec and shuts off almost like its not getting fuel but cranks right back up

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Hi, do a fuel pressure check to make sure you are getting enough fuel to engine. Also do you have a security system. if i can help just re post

Posted on Jan 04, 2011

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if it is high, the fuel regulator is at fault.

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What are the timing specs for a 1991 chevy s10 blazer 4x4 4.3? changed timing chain and gears and timing is off. got marks together but still won't crank.


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Feb 19, 2010 | 1991 Chevrolet S-10 Blazer

1 Answer

1991 chevy S10 blazer fluctuating oil pressure


I assume from the year it has high mileage. With mileage comes wear in these engine's bearings allowing oil pressure to drop because of the excess clearance between cam and bearings, also the crank and bearings. When the engine is hot and idling the oil is thinner and goes by the bearings quicker. If you have good oil pressure while driving, I'd leave it alone, maybe use a thicker oil or some lucas additive. My 89 does the same thing sometimes in the summer, but don't remember it doing it this summer. I use Mobil-1 and an AC Delco filter.

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1 Answer

1985 chevy Blazer cranks up, runs rough, then


have you checked, cady, fuel tank, is it getting the right amount of gas and air? plugs and wires, go with general mantinence first then step up. i have a 85 s10 blazer that was a lemon off the lot but has over 300000 on it and it has the same prob i fix it tempurary by flipping the lid on the breather upside down so it gets more air

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Completed tune up, drove for 2 blocks, engine shut down


Just having fuel is not enough on this engine, here are the spec's. Even 1 psi out of spec can cause a no start.

Fuel Pressure
Pressure 1 (PSI) Pressure 2 (PSI) Pressure 3 (PSI) Range Note Range Note Range Note 60.0 - 66.0 Y131 50.0 - 63.0 Y132 66.0 Y133 Y131: System pressure with ignition on (PSI).
Y132: System pressure while idling (PSI).
Y133: Fuel pump pressure (PSI) with return line briefly restricted.



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1991 chevy lumina 3.1 liter.problem started it was fine then went 3 blocks and it died stopping at sign.had problems getting it back started and it drive fine for a minute and lost power to like 20 mph but...


It is one of 2 things fuel pump or Crank Shaft Position Sensor. Best bet would be the Crank Shaft Sensor, and what that does is tell the computer where the crank is and when to fire the right plug at the right time

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Cranks but won't start


Jus the motor shut off? Or did all the gagues, lights, everything seem to shut down? If all the gagues acted up, sounds like the ignition switch, not the lock cylinder, the acutal ignition switch.

Sep 14, 2008 | 1991 Chevrolet S-10 Blazer

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