Strange problem with88 c1500 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OJ1988 · 10-29-2014, 09:02 AM

So this just started. When driving my truck, after it warms up, while cruising it will randomly cut, or buck, and even if in 5th gear, the shoft light will flicker, with the stumble.

It does It randomly.

Tried pulling trouble codes, none came up.

This is a fresh 350 tbi. Has about 8000 miles on it, including new dist, wires, all sensors, rebuilt throttlebody etc....

Fuel pump was replaced a few years ago.

Just started this yesterday, it's my daily driver.

Where to start?

Cabnchassis · 11-17-2014, 11:51 PM

What trans?

ChevyTech · 11-18-2014, 02:20 PM

It sounds like heat could be causing the ignition module in the distributor to break down. Many auto parts stores in my area will test the distributor module for free if you bring it in.

The test results from these stores are not always accurate, and some times the will say the module is good when it is not, but for a free test that may find the problem it is worth a try.

Make sure when you install or reinstall the distributor module that you use heat sink compound under it. The compound helps dissipate heat from the module. Without it, the module will fail.

If the distributor module is ok, you should test the fuel pressure with the engine running.

RatPoweredTruck · 11-18-2014, 10:27 PM

Grounds? Also, check for spark arching off the wires or plugs.

10-29-2014, 09:02 AM	#1
OJ1988 Just a car guy Join Date: Feb 2006 Location: New Washington, IN Posts: 991	Strange problem with88 c1500 So this just started. When driving my truck, after it warms up, while cruising it will randomly cut, or buck, and even if in 5th gear, the shoft light will flicker, with the stumble. It does It randomly. Tried pulling trouble codes, none came up. This is a fresh 350 tbi. Has about 8000 miles on it, including new dist, wires, all sensors, rebuilt throttlebody etc.... Fuel pump was replaced a few years ago. Just started this yesterday, it's my daily driver. Where to start? __________________ 1955 belair Blown Pro Street cruiser 1971 Camaro Pro Touring 1973 Vega Drag Car 1970 C20 tow rig

11-17-2014, 11:51 PM	#2
Cabnchassis Registered User Join Date: Mar 2014 Location: Redwood City Posts: 242	Re: Strange problem with88 c1500 What trans? __________________ 1991 R3500 3+3 C+C 6.2/4l80e/14ff Fleetside Dually 1992 K2500 ECLB 5.7/4l80e/14sf(g80) 8600gvwr 1991 CR500 (95 Burb wouldn't stop catching fire )

11-18-2014, 02:20 PM	#3
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: Strange problem with88 c1500 It sounds like heat could be causing the ignition module in the distributor to break down. Many auto parts stores in my area will test the distributor module for free if you bring it in. The test results from these stores are not always accurate, and some times the will say the module is good when it is not, but for a free test that may find the problem it is worth a try. Make sure when you install or reinstall the distributor module that you use heat sink compound under it. The compound helps dissipate heat from the module. Without it, the module will fail. If the distributor module is ok, you should test the fuel pressure with the engine running. __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.

11-18-2014, 10:27 PM	#4
RatPoweredTruck Registered User Join Date: Jul 2007 Location: Odessa, Tx Posts: 85	Re: Strange problem with88 c1500 Grounds? Also, check for spark arching off the wires or plugs.



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