sputtering at cruising speeds

[wally91vhevrolet]

yea its definately not ignition, ima have my fuel pressure checked to see if its the pump, i got a new pressure regulator and i know its not my injectors, if the pressure jumps or is off ill put in a relay first to be sure and then if that dont work a pump? thanks

[sivadnar]

The shop said they think it is my fuel pump and/or fuel injectors. The fuel pressure supplied by the pump is approximately 50 psi and specs are 60-65 psi. Would this difference really make my truck sputter at cruising speeds?

Thanks,
sivadnar

[2000CAYukon]

Originally Posted by sivadnar

The shop said they think it is my fuel pump and/or fuel injectors. The fuel pressure supplied by the pump is approximately 50 psi and specs are 60-65 psi. Would this difference really make my truck sputter at cruising speeds?

Thanks,
sivadnar

Sivadnar,
What year is your truck? Must be 96 or newer with the specs you listed. The TBI Trucks (87-95) have a lower pressure which is 9-13 PSI.

//2000CAYukon

[wally91vhevrolet]

i just went and got a fuel pump and filter, plan to put it on within the next few days, ill post and say if that fixxes it or not

[wally91vhevrolet]

ok yall, new pump, strainer, filter, relay, STILL RUNNING BAD, its gotten to the point now where the idle isnt smooth and its still spudderin when i go down the road, ima carry it later n get a full computer diagnostics done on it. do yall think my computer has gone bad? everything i mean EVERYTHING else has been checked and/or replaced

[sivadnar]

My truck is a '98.

I installed a fuel pump this weekend too, to no avail.

I have done the following in this order;
Fuel Treatment
Fuel Filter
Plugs & Wires
Cap & Rotor
Fuel Pump
Fuel Treatment

Wally, I took my truck to an actual mechanic to get a "full diagnosis." They told me it was likely my fuel pump; but they could not be certain because the problem is intermittent.

Just to further describe my problem, which sounds the same as Wally's:
Upon reaching 65-70 mph going uphill with AC on, my truck will sputter significantly. If I hammer the pedal, the truck will level out until returning to OD then it will do it again.

It does not seem to do this if the AC is off and I'm just cruising.

I'm done screwing with. I'll be selling my truck very soon. Please post if you have any last minute ideas!

Thanks for all of the help.

Cheers,
sivadnar

[steve3320]

Originally Posted by sivadnar

My truck is a '98.

I installed a fuel pump this weekend too, to no avail.

I have done the following in this order;
Fuel Treatment
Fuel Filter
Plugs & Wires
Cap & Rotor
Fuel Pump
Fuel Treatment

Wally, I took my truck to an actual mechanic to get a "full diagnosis." They told me it was likely my fuel pump; but they could not be certain because the problem is intermittent.

Just to further describe my problem, which sounds the same as Wally's:
Upon reaching 65-70 mph going uphill with AC on, my truck will sputter significantly. If I hammer the pedal, the truck will level out until returning to OD then it will do it again.

It does not seem to do this if the AC is off and I'm just cruising.

I'm done screwing with. I'll be selling my truck very soon. Please post if you have any last minute ideas!

Thanks for all of the help.

Cheers,
sivadnar

I don't remember if you said this problem occurs hot or cold, or all the time. The only other thing I could think to check would be the catalytic convertor. It could be blocked or partially blocked causing a stall when the backpressure gets to high (hard pedal applied).

[wally91vhevrolet]

haha i give all of yall permision to shoot me....... and to every1 who is having this problem... CHECK YOUR WIRES..... my #6 plug wire was BAD i had a scope done and it told me.. i feel stupid now.. so CHECK YOUR WIRES lol... also just because the wires are brand new dont mean one is still not bad... take one u KNOW is good and swap it out with the others one by one and see if this solves your prob.. or just do what i did and go have a "scope" done.. cost me $60 but i guess it woulda been worth it in the begining after replacing everything i have replaced...

[Fireplug]

I was just about to post that you have a bad ign wire but i see that you found it. Next time take a small plastic spray bottle and fill it with water and mist the wires with that water you will see any bad wires because of the little sparks that you will see
as a gm tech i have see that problem a billion times

[wally91vhevrolet]

yea the spray bottle is a good idea i havnt heard that be4... i checked my wires n they had all LOOKED good and they were ONLY 3 weeks old.... AC Delco's too.. so i figured they were good... but i got it fixxed.. truck runs like new now so its all good