Need Help - At end of my rope with '94 K2500 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bpeters5814 · 03-11-2014, 02:59 PM

Have a '94 K2500 that I love, but it has something funky going on, and I no longer trust it. When I start it, it will chug for 10-15 seconds when I give it gas. After that, it clears up and runs fine. Sometimes it does it every time I start it during the day, sometimes it only does it the first time I start it in the morning. Now, it has developed an issue where I will be sitting at a stop sign, and go to take off, and it will fall flat, like its getting no fuel. Then it'll catch up and be fine.

I have thrown money and parts at it. New plugs, wires, the timing chain was bad so fixed that, and the shop I use has a parts vehicle, so every sensor has been swapped and tested. New fuel filter and cap and rotor also. Probably other stuff I have forgotten. Compression was tested and one was a little low, but the mechanic didn't feel it was enough to cause the issue.

Love the truck and don't want to buy a different one, but it's my main farm truck and needs to be reliable. Any ideas? TIA

mountie · 03-11-2014, 05:34 PM

Seems like fuel pump.

bpeters5814 · 03-11-2014, 06:31 PM

I thought so, too, but it has been tested and supposedly tests fine. I've thought about changing it anyway, but I'm a little hesitant because I've done a couple and they always turn out to be a real pain. Probably will be my next move, though.

lha1992 · 03-12-2014, 09:23 PM

Fuel pump brother! My 89 had a similar issue at first it'd run fine but give out at higher RPMs an thought maybe something with the motor an it was nothing then one day in 5o'clock traffic it dies causing a huge back up an had to get it towed. Dead fuel pump. Was the original one in 127,000miles at that time. Got one from Napa an is been 3yrs an the truck has 132,000 on it an runs great!

Cabnchassis · 03-25-2014, 04:52 PM

Intake manifold gasket is crossed over a little or TB base gasket is leaking or IAC is failed. Also if the CTs fail and the ECU thinks the motor is running too cold it over fuels to help save the motor. Those things and bad fuel pressure are all that can cause this truck to run like that. I just typed a book about how to trouble shoot it on this other thread, check it out. I fought this problem for most of a year, I'd completely had it when I finally figured it out.

NastyBuzzard · 03-25-2014, 09:09 PM

It's fuel pump. Had the same exact thing happen to me.

03-11-2014, 02:59 PM	#1
bpeters5814 Registered User Join Date: Apr 2008 Location: Worms, Nebraska Posts: 304	Need Help - At end of my rope with '94 K2500 Have a '94 K2500 that I love, but it has something funky going on, and I no longer trust it. When I start it, it will chug for 10-15 seconds when I give it gas. After that, it clears up and runs fine. Sometimes it does it every time I start it during the day, sometimes it only does it the first time I start it in the morning. Now, it has developed an issue where I will be sitting at a stop sign, and go to take off, and it will fall flat, like its getting no fuel. Then it'll catch up and be fine. I have thrown money and parts at it. New plugs, wires, the timing chain was bad so fixed that, and the shop I use has a parts vehicle, so every sensor has been swapped and tested. New fuel filter and cap and rotor also. Probably other stuff I have forgotten. Compression was tested and one was a little low, but the mechanic didn't feel it was enough to cause the issue. Love the truck and don't want to buy a different one, but it's my main farm truck and needs to be reliable. Any ideas? TIA __________________ '88 Chevy K3500 (Grandpa's Bomb) '94 Chevy K2500

03-11-2014, 05:34 PM	#2
mountie Registered User Join Date: Jun 2011 Location: Bradenton, Fla. Posts: 1,100	Re: Need Help - At end of my rope with '94 K2500 Seems like fuel pump. __________________ '70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018)

03-11-2014, 06:31 PM	#3
bpeters5814 Registered User Join Date: Apr 2008 Location: Worms, Nebraska Posts: 304	Re: Need Help - At end of my rope with '94 K2500 I thought so, too, but it has been tested and supposedly tests fine. I've thought about changing it anyway, but I'm a little hesitant because I've done a couple and they always turn out to be a real pain. Probably will be my next move, though. __________________ '88 Chevy K3500 (Grandpa's Bomb) '94 Chevy K2500

03-12-2014, 09:23 PM	#4
lha1992 Registered User Join Date: Apr 2010 Location: Everett, WA Posts: 504	Re: Need Help - At end of my rope with '94 K2500 Fuel pump brother! My 89 had a similar issue at first it'd run fine but give out at higher RPMs an thought maybe something with the motor an it was nothing then one day in 5o'clock traffic it dies causing a huge back up an had to get it towed. Dead fuel pump. Was the original one in 127,000miles at that time. Got one from Napa an is been 3yrs an the truck has 132,000 on it an runs great!

03-25-2014, 04:52 PM	#5
Cabnchassis Registered User Join Date: Mar 2014 Location: Redwood City Posts: 242	Re: Need Help - At end of my rope with '94 K2500 Intake manifold gasket is crossed over a little or TB base gasket is leaking or IAC is failed. Also if the CTs fail and the ECU thinks the motor is running too cold it over fuels to help save the motor. Those things and bad fuel pressure are all that can cause this truck to run like that. I just typed a book about how to trouble shoot it on this other thread, check it out. I fought this problem for most of a year, I'd completely had it when I finally figured it out.

03-25-2014, 09:09 PM	#6
NastyBuzzard Registered User Join Date: Oct 2013 Location: Saluda, SC Posts: 1,276	Re: Need Help - At end of my rope with '94 K2500 It's fuel pump. Had the same exact thing happen to me.



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