Question about 1991 Chevrolet K1500
After driving about 10 miles or so(fine until then) when I press the gas to accelerate at highway speed, the truck bogs out like its not getting fuel, air, or the timing is off. The truck will not start now. *When I turn the ignition it turns over but when or if it starts it sound like everything is out of time and it just shuts off. *Distributor cap and plugs were replaced a couple years ago. The truck does have an electrical issue. Radio, heater and dash flicker and freak out now and then.
How long since over-all tune-up? Use a gage and check proper fuel pressure, tbi fuel pressure 9--13 psi. 5 psi won't start and run a v8. In my opinion. I don't know liter size of engine?
Can you check applicable trouble codes? Your obd1, you should be able to check some codes, if your check engine light works. You use a jumper wire between the A & B terminals at your datalink connector, then turn the key just till the dash lites come on, then the mil starts flashing, you count the flashes to get the codes. Your looking for two digit codes.
If you think ignition and or valve timing is off, check it. My info for ignition timing, just says to check the decal under the hood for specs.
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Posted on Jan 02, 2017
I found the fuel pressure regulator on the fuel rail was leaking fuel into the intake manifold via the vacuum hose.Was hard to start and rough idle. Pull vacuum line and see if fuel is coming out-if so like me-replace it. About 50.00 at Murrays. Also the two inner cylinders on the passenger side-opposite of the vacuum line will be very rich fouled-replace them all
Posted on Feb 11, 2009
1-timing on truck is ajusted by ecm,when u moved it u cause cam sensor code because it detected timing was off! 2-o2 sensors has the role of detecting air to fuel ratio coming out of exhaust,sends signal to ecm wich collects data from other sensors from that sets timing for best performance,if ecm detects something wrong in system data it will give engine code,that code will point at problem area,in your case o2 sensors probably detected lean fuel ratio that points to fuel system,blocked fuel filter or fuel pump faillure,elect,circuit damage,hope it helped!
Posted on May 02, 2009
The first thing to try is a new fuel filter. There is sock filter within the fuel tank also, but it fails less often. If the engine has lots of miles, it may need a new O2 sensor although the codes should point that out if it were a problem.
Posted on Aug 08, 2009
85 with TBI only needs 13lbs of fuel pressure. verify that the fuel filter is clean. there is no easy way to ck fuel pressure, special adapters are needed, I dont have info here at home but there should be a relay for the pump, on the firewall and the oil pressure switch also powers the pump. did you replace the pump trying to fix this problem or did you just mention it to help troubleshoot the problem? verify that the fuel pump wiring has a good ground, should have been a eyelet that bolted to the frame..when you initially turn the key on, you should hera the fuel pump power up for 2 seconds, then go off, after the engine starts, the power for the pump goes through the oil pressure switch.
Posted on Sep 19, 2009
yes sounds like the fuel filter is clogged when push gas pedal put it in clear flood mood and resets the fuel system and starts over thats why it starts when push to floor creates back pressure sucks debri bottom of filter
Posted on Sep 25, 2010
Testimonial: "Thank you for you timely feedback. I will replace the fuel filter ASAP. "
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