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1990 cadilac 4.5 turns over wont fire backfires bad wants go go but wont unless dump gad in throttle body

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  • Cars & Trucks Master
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Check the firing order is correct
check timing of the ignition

Posted on Dec 22, 2016

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6ya6ya
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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: 1992 Silverado backfiring through the throttle body

you could put the pickup on a cylinder pressure test and see if you have a bad valve causing the engine to pop.
you could have a bad wire or spark plug.
the timming chain could of went off a cog on the timming sprokets causing to pop.
gettin to much gas could cause it to.

Posted on Jan 23, 2009

johnr1959
  • 56 Answers

SOURCE: 1991 dodge ram 360 w/throttle body problem

Float is stuck in carburetor needle and seat probably stuck open remove the top of carb Check for dirt in the float bowl spray clean with carb cleaner try turning over the motor and see if fuel stops when bowl is 2/3 rds full if not clean again and make sure you have a in-line fuel filter installed also.

Posted on Feb 03, 2009

hotrodtod38
  • 141 Answers

SOURCE: 1998 GMC Sierra won't fire and run

INJECTOR MAYBE?

Posted on Feb 13, 2009

  • 123 Answers

SOURCE: car won't start, little backfire through throttle body

water in the gas?
lose wire in the plugs
fuel filter is dirty
auto choke is stuck
What?????????

Posted on Apr 22, 2009

  • 93 Answers

SOURCE: Chevy 454 back fire

Ignition timing is set by the computer as long as the distributor pickup point is within reason.

It could be running too lean. One of the TBI injectors may be sticking or not working (wiring or computer problem), or fuel pressure could be low.

Posted on May 21, 2009

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1 Answer

1990 2.9 bronco 2 ..bucking backfiring, and wont idle up..


It sounds like a major vacuum leak into the intake manifold. Check all of the hoses attached to the intake and throttle body for leaks including the power brake booster hose.

Feb 10, 2015 | Cars & Trucks

1 Answer

Truck wont start unless i pour some fuel in throttle body truck quits after dumped fuel burns off


sounds like the fuel pump or filter needs replaced. pull out line off filter underneath and turn key. if fuel comes out slow try replacing filter and trying again. if pressure is still low fuelpump is bad or a blown fuse or bad relay.

Sep 25, 2011 | 1997 Chevrolet K1500

1 Answer

I have a 1992 camaro RS 305 with 5 speed. It will turn over but won't start, if you pour gas in throttle body it will fire right up and run like it should. I put in new fuel pump, new ECU, new TPS, still...


If you turn the key to the on position and you hear the fuel pump run, does it run for longer then 5 seconds? If so then you are going to need to look at your fuel filter, if it stays running then you are going to need to look at your fuel regulator. You can also go to Auto Zone and buy a fuel pressure test kit or rent one, and check your fuel pressure on the fuel rails. Check for spark also, if you are low on spark then you are not going to fire, unless you dump more fuel then you need to into the throttle body.

Nov 07, 2010 | 1992 Chevrolet Camaro

2 Answers

1990 chevy blazer 350 ci throttle body fuel injected . the motor is flooding out u can see the injectors keep dumping fuel into the throttle body


Sounds like you have an injector leaking. Have someone just cycle the key on and off to run the fuel pump but don't crank the engine. If you see fuel dripping from the injectors, unbolt the injector cover on the throttle body, remove the injectors and replace the orings around the injectors.

Jul 22, 2010 | 1991 Chevrolet C1500

2 Answers

I have a 302, it has spark it has fuel pressure and it runs when i dump gas in the intake however it will not stay running


if you've gotta dump more gas in it than it should be getting, it may have a large vacuum leak

Sep 28, 2009 | 1990 Ford F150

1 Answer

Wont start after being turned off for at least 30 minutes


Im not sure what you mean when you say wont start after being turn off for 30min, do you mean the starter wont turn the motor over after 30min or the engine turn over but it wont fire/run? if it start every time after its cool down. check the coil, the original coil tend to fail with heat over time. if its original coil for being 1990 I would go ahead and place it. distributor Assembly unit will also need replacing if its original and having high miles. a sign of the coil going bad when it get hot it quit working until its cool off. fuel pump can be another causing the problem. hope that help some

Jul 21, 2009 | 1990 Honda Civic

1 Answer

1990 Cadilac Eldorado, no passing gear


Check to see if the TV cable to the transmission is hooked to the throttle body.

Mar 24, 2009 | 1990 Cadillac Eldorado

1 Answer

I have a 1990 Buick Skylark, I am having problems with it backfiring in the throttle body and also have low gas mileage. I am only getting about 13 miles to the gallon. I have changed to plugs and wires....


What motor does it have? If it is the quad four, you probably need to replace everything under the cover. If it is the 2.5, check your firing order/timing.

Mar 05, 2009 | 1990 Buick Skylark

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