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icicle 04-09-2013 01:21 PM

Strange power loss
 
I have a 95 with a 5 speed and a 2.5L. I completely redid everything ignition related the first weekend I brought it home, including plugs, wires, rotor, cap, and coil. It also has a new IAC valve. These repairs were done probably 2 months ago. Recently, in the past week or so I'd say, it seems as if in 5th gear at 60 MPH, it feels as if it hesitates momentarily under constant steady throttle, meaning it hesitates not when you apply said throttle, but just when you're cruising down the highway with your foot at a constant spot. Flooring it, or letting my foot off the gas makes it go away, but if I leave my foot where it was when it happens it goes away after 2 or 3 seconds on it's own. It feels like a loss of power, like someone has their foot on the brake for those 2-3 seconds.

Right now my theories are TPS sensor, MAP Sensor, fuel pump, fuel filter, or injectors. I have a new fuel filter in the garage I'll throw in, and I ordered a TPS and MAP from rockauto since they are cheap.I'll also do the can of sea foam into a vacuum line cleaning trick I think.

Idle is just the slightest bit noticeably rough also, which furthers my thought that it's likely a sensor or something.

Anyone else have any thoughts?

sevenservices 04-09-2013 01:29 PM

3 things come to mind...

1. Air filter, if its a little wet or clogged it will almost act like a choke when at certain RPMs. Or crap in the air box.

2. Maybe some water in the gas? Not enough to choke it but enough to sputter a little bit.

3. I had that same thing happen once and it was my battery cable being loose on the starter side. The throttle bodies are very sensitive and when voltage drops, it starts to sputter a little. I cleaned the connections and tightened back down and it was good ever since, going on 4 years now.

icicle 04-09-2013 01:56 PM

Air filter is a K&N and it was cleaned 2 months ago when I did the tuneup.

Water in gas is a good one, I'll look into it.

Battery is a brand new Optima Yellow top with cleaned and tight connectors, but that doesn't mean I didn't bump it or don't have something tight, I'll take a peak.

Thanks for the ideas! :flowers:

sevenservices 04-09-2013 02:59 PM

Quote:

Originally Posted by icicle (Post 3614576)
Air filter is a K&N and it was cleaned 2 months ago when I did the tuneup.

Water in gas is a good one, I'll look into it.

Battery is a brand new Optima Yellow top with cleaned and tight connectors, but that doesn't mean I didn't bump it or don't have something tight, I'll take a peak.

Thanks for the ideas! :flowers:

No prob, double check your air box as well. I seen leaves packed into one under the filter once, prob. from chipmunks or mice or something.

Also, my battery cable was loose on the opposite end, check your starter side just to be sure its tight.

For water, I use Drygas. Its a liquid you poor in and it eats up any moisture in the fuel system. A little water in there is a pain because it makes it sputter at completely random times which is hard for troubleshooting.

Garyk 04-09-2013 03:05 PM

Try some injector cleaner....

icicle 04-15-2013 11:03 AM

Update: I have changed the fuel filter, TPS, MAP, run cleaner through the system (sea foam carbon blow out) Injector cleaner in tank, HEET was in tank, and it's getting worse.

On my way home from test drive last night, the CEL came on, code for Intake temp sensor! This is a code that would make sense with the power loss, new sensor on the way. Must have finally gotten enough out of range to trip a CEL.

icicle 05-08-2013 02:24 PM

Solved: It finally tripped a code for the O2 sensor. Upon replacement, problem is gone. I wish it would have sent me a code to begin with! This totally makes sense and illustrates why it ran fine warm, the computer ignores o2 sensor input until at operating temp


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