Low power/ surging
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Senior User
Joined: Aug 2009
Posts: 115
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From: NW Pa.
Low power/ surging
I have a late '99. It's been weak all summer. Took it to the dealership. They put it on the computer and said the only problem was bad injectors. Specifically #8. I replaced them all. It's still weak and now is starting to surge going down the road. I have my suspicions but I'm not a mechanic. Please give me done ideas. Thanks.
Posting Guru
Joined: Sep 2014
Posts: 2,404
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From: Asheville-where weird is
What is your oil level, fuel level, fuel pressure, ICP? Have you ever changed your CPS? Look for chaffing under the wiring on the drivers side wiring harness over the valve cover. Check the tin nut on the back of the IPR.
What are your suspicions.
What are your suspicions.
Thread Starter
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Senior User
Joined: Aug 2009
Posts: 115
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From: NW Pa.
CPA=CPS, damn spell check.
Here's what it does. I pull up to a stop sign, hit the throttle, nothin'. Takes a few seconds to respond. Then slowly starts to move. No SES light. When under a load, weather pulling a trailer or going up a hill, it chugs/surges a little bit. Could this be a CPS or TPS issue? Time for the hutch mod?
Here's what it does. I pull up to a stop sign, hit the throttle, nothin'. Takes a few seconds to respond. Then slowly starts to move. No SES light. When under a load, weather pulling a trailer or going up a hill, it chugs/surges a little bit. Could this be a CPS or TPS issue? Time for the hutch mod?
Laughing Gas
Joined: Jan 2007
Posts: 870
Likes: 9
From: Carbondale, CO
CPA=CPS, damn spell check.
Here's what it does. I pull up to a stop sign, hit the throttle, nothin'. Takes a few seconds to respond. Then slowly starts to move. No SES light. When under a load, weather pulling a trailer or going up a hill, it chugs/surges a little bit. Could this be a CPS or TPS issue? Time for the hutch mod?
Here's what it does. I pull up to a stop sign, hit the throttle, nothin'. Takes a few seconds to respond. Then slowly starts to move. No SES light. When under a load, weather pulling a trailer or going up a hill, it chugs/surges a little bit. Could this be a CPS or TPS issue? Time for the hutch mod?
You can try unplugging the ICP connector on drivers side head. Look for wet/oil in connector. Try driving this way, disconnected. It will trip a check engine light, but see if any different performance.
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Senior User
Joined: Aug 2009
Posts: 115
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From: NW Pa.
I'll try cruise control tonight. I have a short commute on dirt roads to work. So a hardly use it. I'll try unplugging the ICP.
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Cargo Master
Joined: Mar 2006
Posts: 2,502
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From: Bend Oregon
It sounds like possible fuel starvation to me. Clogged pickup in the tank, fuel pump pre strainer you didn't know was there from previous owner etc.
Lead Driver
Joined: Sep 2005
Posts: 9,399
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From: Norco,CA
Fuel pressure under load is important, I'd make something up to check. Sounds like TPS from a stop sign but other tests should be done first. Also have you checked your EBPV, Is it partly closed? If fuel pressure is low under load I'd drop the tank and do the mods, then change the lines and pump if need be.