Question about 1997 Chevrolet Blazer

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DoI have a fuel or sensor problem?

I have fuel psi to the line behind the throttle body but it still won't start. a little gas down the throttle body and it will.

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Do a fuel pressure check, not sure what engine you have but a 4.3 liter needs at least 40-50psi to run normal.

Posted on Jul 29, 2009

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1988 chevy S10 turns over but won't start getting spark put in new fuel pump,cpu and injector. If I pour A little gas in throttle body hole it will fire for a few sec. fueses all test good.


Hello, just had this problem myself. Check your EGR valve by pulling the vacume line off and pushing up under the valve put your finger over the vacume line hole and release the valve, if it returns to normal position then its bad if not its good. If its bad it needs replaced. Mine did the exact same thing and thats what it was. Hope this helps

Jan 20, 2013 | 1988 Chevrolet S-10

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I own a 1997 Pontiac Bonnelville/se 3800series/v6. I replaced the throttle position sensor with used one, one of the vacumn lines to the throttle body has a bad end connector, could be a leak, after d


It sounds like you have a defective fuel pump, buy a pressure test gauge and hook it up to the pressure test port on the fuel delivery rail to the fuel injectors, the pressure should be about 60 PSI and not drop more than 5 PSI after engine shut down.

Sep 19, 2012 | Pontiac Bonneville Cars & Trucks

1 Answer

No gas coming out of the carb


on cool motor, remove fuel line to throttle body, turn switch to accessory position fuel should flow freely. no flow check filter located on frame rail. or defective fuel pump. pressure should be(if checked with good guage)45-55 psi. if all checks out throttle body jet clogged with gunk or you have broken-damaged throttle body wires. all of this i have found on 2.8 liter engines.-------jawstech goodluck hope this helps.

Nov 25, 2011 | 1993 Chevrolet S-10 Blazer

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1999 S-10 PU TURNS OVER AND WE HAVE SPARK IF YOU PUT A SCREWDRIVER IN THE PLUG WIRE AND HOLD IT CLOSE TO A GROUND. FUEL COMS OUT OF THE FUEL LINE WHEN YOU PUSH THE STEM IN THE VALVE ON THE FUEL LINE


I would check the actual fuel pressure with a fuel pressure gauge. If you have a 4.3 (eigth vin W) engine the fuel pressure should be at least 58 psi. You can try to spray a little carb spray in the throttle body while somebody cranks the engine over. If it starts on carb spray than you know you have a fuel issue.

If fuel pressure is low by as little as 1 psi (yes one psi) the vehicle will not start and you're probably looking at a bad fuel pump.

Dec 07, 2010 | 1995 Mercury Grand Marquis

2 Answers

Maybe fuel injection?


TRY REPLACING THE FUEL FILTER , IF THAT HELPS ,BUT DOESN'T FIX IT,IT MAY BE THE FUEL PUMP,BUT IT'S DOUBTFUL IF IT RUNS GOOD AFTER DRIVING THE CAR ,THEN YOU CAN TRY CLEANING THE THROTTLE BODY,IF THAT DOESN'T HELP ,MAKE SURE TO GET THROTTLE BODY & INTAKE CLEANER SPRAY, BECAUSE OTHER SPRAYS,SUCH AS CARB OR BRAKE CLEANER, ETC, WILL DAMAGE IT ,& ALSO GET SOME MAF (MASS AIR FLOW) SENSOR CLEANER SPRAY & CLEAN THE MAF (MASS AIR FLOW) SENSOR ,TO DO BOTH YOU WILL HAVE TO REMOVE THE AIR INTAKE TUBE AND AIR FILTER BOX COVER ,WHEN CLEANING THE THROTTLE BODY YOU NEED TO OPEN THE FLAP IN THE THROTTLE BODY BY EITHER HAVING SOMEONE PRESS THE GAS PEDAL OR YOU CAN DO IT BY HAND TO GET ALL OF IT, AND THE INSIDE OF THE INTAKE CLEAN,YOU WILL WANT TO PUT AN OLD RAG OR SOMETHING UNDER THE OPENING TO CATCH THE EXCESS CLEANER COMING BACK OUT,YOU CAN ALSO USE YOUR FINGER TO HELP GET THE BLACK OILY SOOT OFF OF THE FLAP & AROUND THE INSIDE OF THE TB (THROTTLE BODY) ,BUT DON'T SPRAY TOO MUCH LIKE 3/4 OF THE CAN INSIDE THE INTAKE ,BECAUSE IT WILL FLOOD THE ENGINE,& IT COULD VAPOR LOCK THE ENGINE, IT WILL TAKE A FEW MOMENTS TO CRANK,AND YOU WILL HAVE TO HOLD THE GAS PEDAL DOWN JUST A LITTLE AFTER IT CRANKS TO CLEAR IT OUT AFTER CLEANING IT ,BUT SAVE SOME OF THE SPRAY TO USE WHILE IT IS RUNNING ,YOU WILL HAVE TO WORK THE THROTTLE BY HAND OR HAVE SOMEBODY INSIDE THE CAR TO DO THIS ,BUT BE SURE NOT TO OVER REV IT ,AND DON'T SPRAY FOR TOO LONG OR THE CATS WILL GET TOO HOT AND TURN CHERRY RED, & OF COURSE THERE ARE OTHER THINGS IT COULD BE ,BUT TRY THOSE FIRST ,& IF THOSE DON'T WORK,WRITE ON HERE AGAIN ,AND SOMEBODY WILL HELP.

Dec 05, 2009 | 2001 Pontiac Grand Am SE

1 Answer

Describe your trouble shooting 91 gmc truck Problem Truck will start it won't idle you have to pump gas pedal to keep it running but it is fluttering the whole time. unhooked vac line to map sensor it will...


test fuel pressure by renting a fuel pressure test kit from schucks or auto zone then turn key on then off if it hits 50 psi it's ok if it drops below 20 psi in one minuter then fuel pump is bad. if it has throttle body injection then replace the injector or pull it apart to see if it is plugged.check oil pressuer switch behind the distributor to see if it is bad it will cause it not to run if defective.

Jul 18, 2009 | 1991 GMC Sierra

1 Answer

I have an 1989 chevy pick up truck. The truck has an rebult 350 engine. The engine runs good and strong, but when you put the gas pedal down pretty far and fast the truck starts running very rough. ...


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. 

Jun 23, 2009 | 1990 Chevrolet K2500

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