1995 c1500 5 spd low on power?

[thebaboss]

Okay so I recently bought a 95 c1500 replaced the clutch (bad throw our bearing) anyways ran great first couple of days. Driving back from the parts store for other things. In 2nd gear if I go above around half throttle or high once it gets to about 2500 rpm you hear it bog down a little like it just gets low on power and the check engine light comes on. Oil pressure is good runs at normal temp. Just wondering what it might be.

 

Engine is a 5.0l tbi.

 

Thanks for reading

 

Sent from my SM-N910V using Tapatalk

[thebaboss]

If I baby it and never go above 2500 rpm the check engine light stays off. Also after the problem happens if you shut the truck of the light goes off again.

 

Sent from my SM-N910V using Tapatalk

[00Silverado4x4]

I'd find out what the fuel pressure is currently and what it's suppose to be and have it tested. I don't have the numbers personally but sounds like low fuel pressure.

[ifixedit]

Check the in-line fuel filter as well, it could be just about completely plugged. Not sure on your truck but it should be located under the driver side door on the inside of the frame. I had a Suburban of the same vintage a number of years ago with the 350 and TBI. When I first got it the thing was a complete dog, no power. I took out the fuel filter to find it was so plugged it was a miracle the truck even ran. With the new fuel filter in place I swear the thing picked up like 50 HP! The difference was night and day.

[thebaboss]

Ok for an update I changed the fuel filter drove it around at night and and it only threw the code once. After multiple times of going WOT all the way to the top of 4th. So I got my buddy to code test it. I'm pretty sure it's a code 43. So that would be the esc or est? Something about a knock test from what I've read around. It has had a new exhaust but I'm not sure if that would be enough engine modification to cause a knock test to fail? Anyways I was wondering what test I should do to try and diagnos this a bit further?

 

Sent from my SM-N910V using Tapatalk

[1997SierraSLT]

could be plugged up catalytic converter.

[ifixedit]

Yep, it is a 1995 and the converter could be plugged. If it revs slow and really doesn't want to wind up that could definitely be the problem. The oil companies have been removing the zinc and phosphorus from their engine oils steadily over the past few years because the new roller cam engines (vs. flat tappet) don't need it and having this in the oil over time has been noted as a contributor to plugging the converters. If your truck is a 1995 with the original converter(s) and was run many miles on the earlier oils prior to the zinc and phosphates being removed, the converter is likely the culprit,

[2018GMC]

catalytic converter or fuel pressure problem

[thebaboss]

Then why would it be tossing code 43? I'm gonna test the esc and est sometime this weekend and it's probably one of those

 

Sent from my SM-N910V using Tapatalk

[ifixedit]

If the exhaust is plugged up there's excessive back pressure which could be casing excessive heat build up or improper / poor cylinder scavenging, thus the pre-detonation and the ping, hence the computer throwing the code 43. Check out those converters!

[thebaboss]

Will do sir thanks for the explanation I very much appreciate it

 

Sent from my SM-N910V using Tapatalk

[thebaboss]

Just got emissions done and im good for 2 years so will there be any problem with just cutting those things out? If there is i guess ill stop being lazy and actually try and fix it.

 

It only does it drifting in parking lots under alot of load. Being that its colder outside it doesnt do it as much anymore

 

Sent from my SM-N910V using Tapatalk

[thebaboss]

Yep, it is a 1995 and the converter could be plugged. If it revs slow and really doesn't want to wind up that could definitely be the problem. The oil companies have been removing the zinc and phosphorus from their engine oils steadily over the past few years because the new roller cam engines (vs. flat tappet) don't need it and having this in the oil over time has been noted as a contributor to plugging the converters. If your truck is a 1995 with the original converter(s) and was run many miles on the earlier oils prior to the zinc and phosphates being removed, the converter is likely the culprit,

Oh and it doesnt rev slow at all. This thing is actually pretty peppy.

 

Sent from my SM-N910V using Tapatalk