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91chevy 5.0 l TBI won't spray any fuel out of injectors .can spray chemtool carb cleaner in throttle body and it starts up . have replaced distributor twice still no injector spray ?

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  • Cars & Trucks Master
  • 341 Answers

Could be clogged up, clean injectors. gunk in bottom of fuel tank can be sucked through and block injectors. also check fuel pump.

Posted on May 07, 2014

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: cannot get 1987 chevy van 20 to keep running... stalls out

Best do a fuel pressure test. Should have chg. fuel filter from the get go. The only other filter is on the end of the fuel pump in tank. Bad gas and dirty gas will plug up fuel filter, hense burn pump up.

Posted on Apr 11, 2009

jagjeffery
  • 318 Answers

SOURCE: throttle body injectors not fiering but there is fuel pressure

the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up

Posted on May 31, 2009

  • 1118 Answers

SOURCE: 1990 Chevrolet Astro, 4.3L TBI, runs smooth until

Chk. your egr. valve and see if its functioning, sometimes it gets a carbon buildup in the intake where it bolts on and also in the valve itself. Take it off and clean the valve with carb. cleaner and also clean out the intake with a screwdriver and shopvac, and make sure the valve works before you reinstall it, and also get a screaned gasget at your local auto parts store before you reinstall it in case you miss some particals in the intake it will insure that no particals will get into the egr valve.

Posted on Sep 07, 2009

Testimonial: "EGR was clogged. Thank You."

terseo
  • 92 Answers

SOURCE: 1994 Yukon running rich and flooding

Fuel pump circuit (low voltage)
Try replacing the fuel pump relay or testing it if you have the manual.

Posted on Sep 20, 2009

  • 30 Answers

SOURCE: fuel injection problem replaced spider injector

THAT SOUNDS LIKE YOU HAVE FUEL PUMP THAT IS GOING OUT ON YOU!

Posted on Oct 27, 2009

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I have 1985 cadillac fleetwood brougham that will not start. I replaced fuel pump and it still wont start. But if you spray starter fluid in caberator/fuel injector. It will start but one that runs out ,...


Did you change the fuel filter it maybe plugged. The fuel regulator maybe weak or not working as well. It is definitely a fuel problem. Is the engine carb or throttle body as I am not sure. If it is a carb the pump in the carb maybe weak or if it is a TBI then check and make sure the injectors are opening in key on position before start up. Hope this helps.

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I would want to know if it is ignition or fuel for sure. There are a few things you can try to narrow down the possible cause.
What does the cap and rotor look like, and is the spark a strong blue when it is running rough ?
Have you checked the actual fuel pressure with a gauge ? Does it matter if you spray carb cleaner or starting fluid into the throttle body ?
Any trouble codes stored in the computer ?
Its possible the coolant temp sensor is wrong and the computer thinks the air temp is 90 degrees instead of say 20 degrees. Or there is moisture in the dist cap or on the plug wires, and so on.

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1989 K1500 was running fine and just quit. Not getting gas but I can hear the fuel pump start when I turn the key on. took fuel line off of TBI and seem to have plenty of gas flow but nothing comes out of...


you need to have the fuel pressure checked with a gage and volume as if its not at the spec the injectors won`t open to spray enough fuel.also you should check the injectors for proper voltages and ground as if these are not within specs then the injectors won`t work either

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I HAVE A 1986 NISSAN 720 2WD PICKUP. IT HAS A CARB ON IT , BUT DID IT COME WITH A CARB OR FUEL INJECTION?


Its BOTH, sort of....TBI Throttle Body Injection. If you look into the carb with engine running, you will see the injector spraying fuel onto the butterfly.

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CHECK OR REPLACE ALL VACUUM HOSES.REPLACE AIR FILTER,REPLACE FUEL FILTER,CLEAN FUEL INJECTORS WITH A CAN OF SEAFOAM TO 3/4 TO FULL TANK OF GAS.CLEAN THE THROTTLE BODY THROTTLE PLATE.SPRAY CARBURETOR CLEANER INTO THROTTLE BODY BREAK CARBON BUILD UP AROUND THROTTLE PLATE AND SPRAY CARB CLEANER AROUND THROTTLE BODY SHAFT AREA REMOVE CARBON BUILD UP TO PREVENT SHAFT FROM BINDIND.BECAREFUL NOT TO GET CARBURETOR CLEANER IN THE IDLE AIR CONTROL VALVE AND OTHER ELECTRICAL PARTS.REPLACE ALL VACUUM HOSES ON THE INTAKE MANIFOLD AND REPLACE PCV.

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86 buick century 2.5l. car sat about 6 months, no start, but when fuel is added to throttle body fires up. when i pulled the fuel line from TBI it sprayed across engine compartment. but when connected...


pressure underhood is good. i'd check the plug conection at the throttle body(injector).see that the injector trigger wires haven't been cut or crimped around the air filter.the injector can be removed from the body for cleaning,but you may want a shop to do that with an ultrasonic cleaner.does it spray at all when cranked?check all sensor connections too.

Jan 26, 2011 | 1986 Buick Century

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My 1998 Chevy Blazer crank excessively when I try to start it. It always starts, and runs good when I get it started, but I would really like a smooth start. I have recently changed the fuel filter, spark...


leaky injector/s is flooding motor, mechanically clean or replace. And clean throttle body while you are at it with spray cleaner. Should be almost spotless where large throttle valve opens and closes.

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2 Answers

1990 Buick Century,F.I. was dirty,car ran rough,son,trying to help sprayed carb cleaner on what he thought was a carb,not running at the time,now it needs to be primed to start,can l do anything ?


he was spraying into a throttle body that consists of an injector(TBI). these cars suffer terribly from EGS(ethanol gas syndrome). Do these simple steps. First; change out fuel filter(buy 2 of these-get the cheapest ones you kind find). Buy a can of SEAFOAM when you get the filters. You need to fill tank with as much Premium fuel as you can.<p>
Change out filter, add SF to gas. Keep car running at least 5 minutes on as steady an idle as you can. Drive car hard for at least 2-3 miles. When you get it home; change out fuel filter again.<p>
The fuel and the emission systems should start to get better. One other thing: buy a new PCV valve(probably cost4-6 bucks) replace it also.<p>
Clean out air filter or replace. Do not!, use carb cleaner or ether again. This should be helpng the cleansing process by now. Your car is full of corn liquor by-product and excessive amounts of water. It's in your fuel; your emission systems and your TBI. Your pump may be filled with it, and not have enough Psi to allow the pump to pump properly. In extreme cases, we've had to replace pump, remove fuel tank and clean it.<p>
When this is all done, always add SFoam every 3-5000 miles to prevent this from happening again.<p>
And at times; the crank/cam sensor has to be replaced.<p>
I don't know how much this car is worth to you, but this is simplier than buying an engine.<p>
The worst case I've seen is the ethanol burns a valve and it has to be rebuild. So try this, I think you can rescue it. Good Luck.

Sep 07, 2009 | 1990 Buick Century

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