Question about GMC C1500

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Truck is hard to start. once started, if you try to accelerate, it acts like the throttle body is vapor locking and then clears up to full power. will act like it is missing as you drive it and you try to accelerate. Fuel pressure is between 55 & 60 lbs. Drops to 52 lbs. when running.

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  • truckdummy Jan 02, 2009

    truck is having trouble starting. rpm's go up and down when idling. put truck in gear and it stalls. can someone tell me where the o2 sensor and IAT sensors are. this just started all of a sudden a few days ago.
    Thanks!!

  • Anonymous Jan 11, 2009

    gmc yukon will not start, but acts as though it's going to turn over/ it's not the battery. Any ideas?

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  • 23 Answers

Check for o2sensor malfunction or IAT sensor malfunction

Posted on Oct 03, 2008

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Hyundai sonatas was parked after normal drive, now will start and shift gears but won't get gas. I suspect a cat got in it and loosened a hose as one did our other car, I can't find where, any ideas


Not understanding what your asking, if it runs and shifts gears then it's getting gas, if it's acting like no power I would look for vacuum hose or considering the fuel pump going bad. Fuel pumps can be interment but eventually will fail. If tank is full probably work ok less than a quarter tank and the pump is out of the fuel and heating up.

Nov 07, 2015 | Hyundai Cars & Trucks

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I'd like to get step to step instructions on how to clean the throttle body in my 2010 Jeep Patriot


  1. Purchase "02 Sensor Safe" throttle body cleaner spray;
  2. Drive the vehicle a few miles, bringing it to full operating temperature, then park it in your driveway with the engine still running;
  3. Gain access to the throttle body, and hold your thumb on the butterfly linkage so that you can open the throttle butterfly when the engine begins to load;
  4. Begin by spraying throttle body cleaner spray on all linkages around the throttle body. If the engine begins to bog because it is aspirating throttle body cleaner, quickly open the throttle butterfly to keep the engine running.
  5. Once you have cleaned all around the throttle body, spray cleaner DIRECTLY INTO THE THROTTLE BODY, opening the throttle sufficiently to keep the engine running. It will run rough during this process but try not to let the engine stall.
  6. If the engine stalls, restart it, and continue cleaning the throttle throat until you see clean metal.
  7. Pour some fuel system cleaner into the gas tank and drive the car a little more before parking it. Try to find an excuse to accelerate hard, WIDE OPEN THROTTLE momentarily if safely possible (as when accelerating to merge into traffic on a highway).
  8. Drive back home.
  9. Done.

Jul 19, 2014 | Jeep Patriot Cars & Trucks

1 Answer

My Hyundai Elantra 2004 is 136,000 miles, it has an acceleration problem at the start when on full Air Conditioning on. No problems as such when already in motion. If I don't turn on the Full AC or if I...


hard to trouble shoot but it seems theres a electrical issue or you ISC (idle speed control) is going bad because this valve closes and opens when the a/c is on or the power steering is in use at idle, did you check for OBD2 codes? try cleaning the throttle body with some carb cleaner and also the ISC valve,heres a pic of what it looks like you will have to remove the air cleaner and next to the throttle body you will see this valve it's also common for they to fail after high milage.

8c20131c-3462-4e35-a289-efd73302b11a.jpg

good luck!

Jul 14, 2014 | 2004 Hyundai Elantra

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I have a 2000 Crown Vic Police Edition. When I 1st bought it, the car was misfiring so I had the two misfiring coil packs replaced after the car broke down and wouldn't accelerate any longer. Almost 5...


Hello! I see you have multiple issues...Do you have the check engine light on? if you can drive the car to an auto parts store they will pull the codes for free...If there aren't any trouble codes I wouldn't suspect coils...It acts like it has a defective Throttle Positioning Sensor (TPS)...Lets eliminate...It is bolted to the side of the throttle body...It has a three wire connector with the following wire colors...Brown/White...Gray/White...And Gray/Red...Do you have a multimeter and a wee bit of experience using it?
If so...Take two safety pins...open and push the point into the rear of the TPS in-place connector into the Gray/White wire and the other into the Gray/Red wire...Set the meter to read 5 volts DC...Connect the + meter probe to the Gray/White pin and the - meter probe to the Gray/Red pin...Start the engine...At idle you must read less then 1 volt (.85)...As you advance the throttle the voltage must rise SMOOTHLY to 4.8 volts at full throttle...If the voltage skips, jumps or never rises above 2.6 volts the TPS is defective...See picture of TPS below...


saailer_175.jpgMOTORCRAFT Part # DY967..Cost=$45

Guru................saailer

Sep 07, 2011 | Ford Crown Victoria Cars & Trucks

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1991 F-150, 302 V-8, 5.0L acts like it has a vapor lock. Fuel injected so can't be vapor lock. After driving a while when I push on the gas there is no power. The engine starts to shake and chug like it...


It does seem like you have done a fair bit of work on this beast...just curious to see whether you had performed a cylinder head pressure test....???? If it is happpening more on hot days, it might be wise to check it whilst the engine is hot, i am suspecting a head gasket or head problem ???.....

Aug 26, 2010 | 1991 Ford F150

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The engine sputters and dies when it heats up. Is this Vapor lock? On cold start it works great and idles just fine but as it heats, the engine starts choking and soon dies out. If this is vapor lock, how...


sounds like the reason it starts and idles fine at start up is your choke is functioning... as your vehicle warms up.. the choke starts to kick off... Inspect your throttle body and idle control motor.

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The engine chokes out and is hard to start.


if it's an EFI engine, the smell of gas might be a couple of things....check fuel lines for broken or loose connections, a leaky fuel filter...another thing to check is the fuel vapor canister which holds vapors from the tank and throttle body....if the purge solenoid is not working for the canister then that will cause the filter in the canister to accumulate too much fuel and start leaking....so you might have an electrical problem with the purge solenoid....also check the EGR valve which will cause your engine to stumble and check all vacuum lines, especially the vacumm line going to the purge solenoid of the fuel vapor canister....the rest of your problem could be anything from timing chain to bad sensors. silvio

Jun 03, 2009 | 1990 Toyota 4Runner

1 Answer

Starts but shuts right off!!!


Sounds like the idle speed motor is not working or very dirty throttle body.
You would have to remove the black plastic hose on top of the throttle body and get a cleaner(throttle body cleaner or carb. cleaner) and spray it down into the opening.
If you have a hard time starting because of the liquid in the throttle body, try holding down the gas pedal while starting.

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