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When i turn off engine you can here pressure through throtle body

Changed engine starts first time sounds well runs ok only that problem

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  • dont see a problem  sounds like ok here this alot just engine settling  what kind of car

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  • Cars & Trucks Master
  • 76,070 Answers

That is normal. It may sound worse if the throttle blade is sludged up, get a can of throttle valve cleaner and clean the throttle valve blade and wip out the intake throttle bore with a soft rag..

Posted on Feb 21, 2012

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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jeff3211
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SOURCE: 1996 tahoe wont start

There should be a 2 second prime by the fuel pump. This prime by the fuel pump is standard for GM vehicles, and if it is not present a hard start is encountered. Turn the ignition to the run position and listen for the fuel pump operation. You may have to have an assistant listen at the fuel filler by installing a long slender funnel into the fuel inlet to the tank, remove the gas cap and insert the funnel, listen at the large end of the funnel to see if the pump can be heard running. Using the funnel acts like a megaphone and makes it easier to hear the pump. If the pump runs for 2 seconds after you turn the key to the run position (DO NOT attempt to start the engine during this test) and the engine doesn't start due to lack of fuel, check for an obstructed fuel filter. (Just change it, it's probably overdue for service anyway since everyone thinks it get changed during oil changes, but never really does.) If the pump doesn't run during prime interval, the computer may not be turning on the fuel pump relay, or the relay is defective. To check the relay, use another of the relays in the power distribution box to substitute for the suspect fuel pump relay and retest. Be sure to wait at least 30 seconds between key cycles since some systems have a delay timer built in to keep the pump from over running. Be sure the relay you sub into the fuel pump socket is identical to the one you remove and properly oriented in the socket. The engine will run following your manual prime because an additional set of contacts in the oil pressure switch will power up the fuel pump relay once proper oil pressure is achieved by an idling engine. If you find that the relay is not defective, but doesn't provide a priming impulse, the engine computer may have failed. DO NOT use a conventional test light with a filament type bulb to check any of the computer circuits that drive the fuel pump relay, or any other computer controlled circuits on an automobile ( or pickup) The driver circuits in a vehicle computer can be blow-out by over-current when using a conventional test light. You can use a high-impedance DVOM for testing safely.

Posted on Nov 02, 2008

psds4
  • 293 Answers

SOURCE: 1997 tahoe wont start

it is not the regulator if it has 40 lbs of pressure try to pinch off the return line and if pressure drops quickly it is either the check valve in the pump or the rubber seal between the pump and the sending unit

Posted on Nov 09, 2008

  • 1118 Answers

SOURCE: fuel pressure regulator

sounds to me that you are smarter than you give yourself credit for. have at it and chg. it. remember trial and error the best teacher. you can do it.

Posted on Jan 05, 2009

wyatt1582
  • 453 Answers

SOURCE: have spark,no fire,sprayed starter fluid into throtle body but does not start

Turn key forward listen for the fuel pump to pressurize if you don't here anything then your fuel pump needs replaced and it's in the tank.

Posted on Apr 21, 2009

pippall
  • 1486 Answers

SOURCE: 1987 chevy S10 engine idle problem

relace the throtle air idle valve.The temp switch will allso cause this problem.

Posted on Jul 19, 2009

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I have a 1986 4wd p.u efi that that i got from relatives who put an engine in thier selfs the motor runs alittle rough ive changed the fuel filter checked plug wires distribter cap rotor put some fuel...


it might be a vacuum problem i have notice that the older Toyota's had i have dealt with allot of them and they have allot of vac lines to i would start with those first though

i hope this helps !

Feb 27, 2011 | 1986 Toyota Pickup 4WD

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Hard to start cold but once running is ok


I believe you have a throtle body correct? IF so you have poor fuel pressure, plugged filter of injector.If by some miracle you have a carberated engine the the fuel is leaking from the bowl. Get a carb rebuild kit.

Aug 23, 2009 | 1987 Chevrolet Blazer

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1987 chevy S10 engine idle problem


relace the throtle air idle valve.The temp switch will allso cause this problem.

Jul 19, 2009 | 1987 Chevrolet S-10 Pickup

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Have spark,no fire,sprayed starter fluid into throtle body but does not start


Turn key forward listen for the fuel pump to pressurize if you don't here anything then your fuel pump needs replaced and it's in the tank.

Apr 21, 2009 | Ford Escort Cars & Trucks

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1994 Ford Probe GT - Uncontrollable Revving


ok, this is simple to do but I would get the Chilton for your car so you can have pictures of what to do. You can get the chilton at the parts store, or the library. It sounds like a throtle body sensor or the throtle body itself, but could also be your air idle control sensor. go down and buy some mass air flow sensor cleaner and a BIG can of carb cleaner. First clean the mass air flow sensor neer the air filter. then remove the throtle body it is held in by 4 botls and you may need a new gasket, NO GASKET GLUE. Now take that big old can of carb cleaner and start cleaning in and out. also down into manifold. clean everything. Now put it back together, remember 4 bolts and no gasket glue. if the problem continues replace the throtle body sensor. and then the idle air intake. It will be cheaper to take it into the part store and have them put it on the computer. They can often tell you what sensor it is ahead of all this but don't let this stop you from cleaning out the throtle body, it will make your car run better and longer.

tepfy

Apr 12, 2009 | 1994 Ford Probe

1 Answer

Car running problem


Ok Slow deceleration rev responce was part of the ECU software to keep the emissions down ,however if this has only just started you can try to reset the IAC valve ,the procedure is as follows.

Turn ignition key on ,unplug the IAC valve ,turn the key off ,replug the IAC valve. do this 3-4 times .Then start the engine while holding the gas pedal to 2000 rpm ,then slowley let the go of the gas pedal till the engine idles .

The IAC valve is located on the throtle body and has 4 wires to it.

Sometimes the throtle body needs to be cleaned and then reset.

Jan 02, 2009 | 1999 Daewoo Lanos

2 Answers

Engine starts and shuts off


you need to clean the throtle body and the idle air control motor .clean it with throtle body cleaner and an old tooth brush take off the tube to your throtle plate assembly open it up by hand spray cleaner brush with tooth brush wipe out with clean rag install tube make sure all your sensor are pluged in start the car let it run till it clears out . if that dont fix it install a new idle air control. let me know how you come out

Dec 26, 2008 | 2000 Ford Windstar

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