No low end power

George Lyerly
65

Asked by George Feb 08, 2010 at 01:51 PM about the 1997 Chevrolet C/K 1500

Question type: Maintenance & Repair

I have a '97 k1500 with a 350 and 4l60e automatic.  Assuming all things are OK with the truck, would a bad fuel pressure regulator cause it to have no power at low rpm's?  It always bogs under acceleration, wont peel out even when its wet, and must downshift to gain speed on the highway  (but it still runs at the normal rpm range when on the highway).

17 Answers

Benjamin Petrik
35

do you have larger than stock tires and mighgt check the exhaust for leaks

Scott O'Connor
45

check the ignition timing. you have to find the spout connector to force the computer to stop advancing the timing and set at base then make sure the engine is at operating temp and idling properly. then find your timing marks with the light and adjust it if needed.

1 out of 1 people think this is helpful.
George Lyerly
65

alright, the exhaust is cutoff under the extended cab just past the cats, so its got low backpressure and that does rob some power but this power loss is recent. There is an exhaust leak near the manifold, but Im not sure if its enough to mess things up like that either. Now what in the world is a spout connector? And wouldn't the engine run horribly across all rpm's if the timing was off? Thanks Yal

Scott O'Connor
45

poor timing has the most effect at idle whereas at higher rpm more advance is needed anyways. a spout connector is basically a small plastic plug that acts as a jumper. its in teh wiring for the distributor. some are by the dist, some by the ignition control module, and some by the pcm under the dash. check a service manual.

Jon Skillman
45

check the fuel pressure regulator and the fuel pump it could possibly be a clogged fuel filter but thats unlikley but a good idea to change it anyway

1 out of 1 people think this is helpful.
George Lyerly
65

the fuel filter i replace last summer, so I doubt its clogged, when I have time Im going try to check the timing and look for this spout thing. Ill probably go ahead and replace the fuel pressure regulator anyway though, someone told me that I should replace it anyway (ive got 185000 miles). If the timing's bad though, dont I have to take a bunch of crap apart to change it then put it all back together and recheck? It seems like this could take a few millenia to do. Or is it simpler than I think? And you said something about idle, I think my idle is ok because it idles normal (smooth, 600rpm), but at times it has been going in to high idle more often, maybe because its been cold down here. The power issue is more notable at accelearation, especially hard acceleration, and I've notice my gas mileage has gone to hell lately too, on a recent road trip and a little bit of in town driving I got 15 mpg, where Ive gotten over 17 on road trips before. Thanks for the help yal!

1 out of 1 people think this is helpful.
John Saffrahn
15,375

if your timing chain is worn bad enough to make it run bad under acceleration then the truck would backfire. i changed the timing chain on my pickup in 6 hrs on a saturday not a big job

1 out of 1 people think this is helpful.
You think this is helpful.
levi98168
120

i have the same problem with my truck. its way bogged down during acceleration and one above the speed of 35 it has power again. and wont peel out, at all. did u ever figure out what was wrong? please let me know, thanks. my email is levi98168@yahoo.com, let me know if u figured out the problem please

12 out of 12 people think this is helpful.
Josh Mercer
65

i had a 94 350 that would act like it stalled when accelerating from a stop and ended up having to replace the egr valve, as for the burning out, re adjust ur timing but find haynes repair manual for ur truck some chevy's have an electronic timing advance which requires u to un hook a wire under the dash. mine wouldnt burnout till i got the timing dead on!!!!

1 out of 1 people think this is helpful.
Thundercloud Hobia
110

Did anyone figure it out cause I have a 92 Chevy k1500 that won't peel out... I can floor it going up a hill and it will go about 35 mph don't like that and want it fix asap thanks I'd anyone see's this and replys....

7 out of 7 people think this is helpful.
George Lyerly
65

Wow I found this post on accident, forgot about it after two years. Power has come and gone and I've since swapped engines and done other things. The MAF sensor and fuel pressure regulator were replaced and I have a feeling those were the culprits. MAF is expensive though, find one off another car, because I don't recommend anything other than factory equipment. Also not a bad idea to do a serious cleanup on the entire intake system and and run SeaFoam every once in a while. About the 94 and 92 trucks, it may be different problems; the 96-99 4th gen trucks have a different fuel injection system (Vortec SFI vs TBI) so they have different things that can go wrong with them.

1 out of 1 people think this is helpful.
MatthewsKitKat
35

I have a 95 gmc the wire ur talk about unhooking. ive unhooked and set timing and then hooked it back up after i do tht the timing advacnes 28 degrees and in neutral in bogs down in acceleration. i have replaced everything on the top end is new except push rods rocker arms value springs. please help im lost now.

1 out of 1 people think this is helpful.
John Saffrahn
15,375

Have you checked fuel pressure? Knock sensor will advance timing to prevent knock and if you're fuel pressure is low then it will run lean and knock causing the ignition to advance until it can't.

1 out of 1 people think this is helpful.
John Saffrahn
15,375

And it won't have much power

Adam Waugh
20

I have a similar problem only thing is my truck runs great until it warms up after warms up and I sit at a light and I take off when it shifts it wants to bog down can somebody help me please

2 out of 2 people think this is helpful.
Zachrjackson
20

Havin same problem, I have no fault codes yet one day my truck has lots of bottom end power and the next day it does not. I noticed the warmer weather seems to rob the power from it. 1998 5.0 vortec

2 out of 2 people think this is helpful.
cgraham14
20

I have a 1989 gmc sierra with a 350 TBI. I have also experienced lack of low end power lately when I take off from a stop. The timing, fuel delivery, even compression all checked out. The engine runs smooth at idle, no backfiring, no missing. It bogs until I hit about 35 mph and then it takes off and it takes off quick!! So..Could it be the torque converter??

2 out of 2 people think this is helpful.

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