Truck has no Power

**Elbutcho** · 01-28-2009, 09:49 AM

I have a 1998 Chevy 1500 truck, when I start it up it runs fine but after it gets a warmed up it loses almost all torque, it also does this under a load. It spurts and misses when given small amount of gas too. I replaced the O2 sensors and fuel filter but that didn't fix the problem. Do you think changing wires, plugs, rottor, and distributor cap will help???

Thanks

**GaryL** · 01-28-2009, 10:19 AM

It could be a tune up issue but it could also be a fuel pump problem. Check your fuel pressure and make sure you have at least 62 psi. If it is lower than that, it will need to be replaced. My Suburban went through this this past summer.

**Elbutcho** · 01-28-2009, 10:42 AM

Originally Posted by GaryL

It could be a tune up issue but it could also be a fuel pump problem. Check your fuel pressure and make sure you have at least 62 psi. If it is lower than that, it will need to be replaced. My Suburban went through this this past summer.

Thanks...................how hard is it to replace a fuel pump if that's the problem???

**werty** · 01-28-2009, 12:56 PM

ive seen junk cats do something like this before also....

**Elbutcho** · 01-28-2009, 02:05 PM

Originally Posted by werty

ive seen junk cats do something like this before also....

Huh???

**werty** · 01-28-2009, 02:08 PM

i had a buick 3.8 that the catylic convertor went to **** and ran good eveytime until it heated up the cat would plug and glow red...

**werty** · 01-28-2009, 02:09 PM

i guess i got censored....sorry

**Elbutcho** · 01-28-2009, 02:29 PM

Originally Posted by werty

i had a buick 3.8 that the catylic convertor went to **** and ran good eveytime until it heated up the cat would plug and glow red...

Someone told me today that may be the problem........said I can check it with one of those infra-red temperature measurement sensors to see if the temp is hotter before the converter.

**mjalstad** · 01-28-2009, 04:30 PM

I've heard of the older Fords having a problem with the ignition module when they when get warmed up. If you haven't done a tune up in a while you may want to start there. Otherwise could this be a MAF problem? You could try driving it till it starts having problems, then unplug the MAF sensor and see if it runs better. As long as you don't have major engine modifications, it should run ok with the MAF unplugged. Changing the fuel pump is not that much fun and would probably take a few hours to replace.