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Removel of injectors 1991 chevy 350 c.i. pick up

Truck running very ruff

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This repair is not that bad. ***NOTE: don't disassemble the TBI unit until you have purchased a new TBI gasket. The gasket is paper and when you remove the screws and pull the top half away, the gasket will tear.*** Remove the air cleaner housing and you will see the T.B.I. unit. Unplug both injectors, remove the torque head screws, and carefully pull the top have of the injector housing away. You now can remove the injectors. Just in case you don't know. If the fuel pressure regulator is original, this would be the time to replace it. I hope this helps, let me know how it went.

Posted on Mar 09, 2014

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Posted on Jan 02, 2017

  • 32 Answers

SOURCE: HOW DO FIX A CODE #42 ON 1991 CHEVY TRUCK

Check to see if the brown and black strip wire is dissconnected by the fuel pump relay if not try dissconnecting the battery for a minute and see if the light comes back on.

Posted on Feb 21, 2009

Molson02536
  • 3854 Answers

SOURCE: I have an 1989 chevy

It sounds like you may have a bad fuel pressure regulator. The fuel pressure regulator is in the throttle body housing and the throttle body in your truck works best at 13psi to 15psi, Any other setting will cause problems. Check the vacuum hose to the fuel pressure regulator at the throttle body and check the fuel pressure at the shredder valve. The way the throttle body works is for the first 75% of the throttle, the ecm uses the signal form the O2 sensors to control the air fuel ratio and tries to keep it to 14.7:1 but at full throttle it by pass the O2 sensor signal and runs the engine richer and advances the timing so you can drive with wings like red bull. The Map sensor then takes over to promote the engine to run richer so you don't run lean and detonation occurs. If there is a problem with your throttle body position sensor, map sensor. and fuel pressure regulator, then at WOT (skinny peddle down) you may be running to rich. The other thing to is if your fuel pressure drops at WOT you'll get a lean condition and then you'll have detonation ( Knocking) and the timing will be turned down to keep detonation from occurring again and that may be the cause if your check engine light too. First and easiest thing to do is change the fuel filter and add fuel injector cleaner to you gas tank, buy a throttle body cleaner and clean your throttle body to make sure you don't have varnish build up around the throttle body, just follow the instruction on the can. Throttle body cleaner not carb cleaner. Start with that and i hope we don't have to do any more to get your truck running like a rocket. Good luck and keep me posted. Be glad to help. 

Posted on Jun 23, 2009

  • 3600 Answers

SOURCE: 90 chevy k1500 350 tbi fuel problem starts but wont stay running

try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch you can't see between the engine and fire wall just behind the distributor and costs 8 bucks to buy new.

Posted on Jan 16, 2010

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