Heavy hesitation problem/ power loss

[MrGriff750]

I own a 91 gst eclipse. In warm weather it hesitates under moderate to heavy throttle and it feels very weak(not near as much pull). On the other hand, When there is cold weather(generally below 20 degrees) the hesitation is almost hard to notice at all and the engine pulls very well. Usually once the engine has been ridden hard a couple times after this, it begins the hesitation problem again. I did a boost leak test and fixed the leaks many months ago and did one recently and all is fine(beside the shaft seal leak but its not leaking enough boost to make a difference.) i have been told that it might be the FPR or timing or just about anything. Does anybody have any ideas of what it could be? Thanks 4 your time.

 

[Mike Marnik]

Do you have a logger?? Sounds like your getting knock. Also what are your mods. It will help us alot if you put them in you car profile if you have any. Also what boost psi are you running?

 

[MrGriff750]

Well my buddy has a logger and he's bringing it tonight. I don't have any modifications on my car other than some "fixes." I'm running 11 or 12 psi right now.

 

[talonTSIDriver]

Hesitation is a sign of poor ignition. Have you changed your plugs and wires yet. I have seen about 5 of these DSM's that do the same things you are describing and it always ended up being the spark plug wires.

 

[MrGriff750]

Yeah i swapped the wires out with a buddy's set of magnecor and still the same hesitation.

 

[talonTSIDriver]

well, check our plugs and see if they are running really rich or lean. White for lean and black for rich.

 

[MrGriff750]

Update...My buddy and me hooked up the logger and everything was reading great. Then we looked at the TPS reading and instead of a smooth line, it was very "squiggley"...as if i was pumping the gas pedal very quickly over and over. Where do i go from here?

 

[MrGriff750]

I checked the timing and instead of a steady pulse of light coming from the light, it was jumpy and would not flash in any specific pattern. Also the timing notch was jumping around in a 5 degree area so it wasnt exactly set to a specific setting. I'm so lost it's not even funny.

 

[ericmetcalf11]

See if you can get a voltmeter again and check the tps again using this link:
http://www.plymouthlaser.com/tps.htm

The reason the timing marked moved was probably because the tps was changing which changes the rpms which changes the timing.

-Eric
no sig

 

[MrGriff750]

Another update...Replaced TPS and problem still persists.

 

[ericmetcalf11]

Here is the data I collected from the MMCD logger...

MrGriff750's car:

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Compared to my car:

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What would cause the TPS to read like this?

 

[MrGriff750]

Does anybody know what my cars tps readings (posted by ericmetcalf11) could mean?

 

[ddavisaf]

Okay, back to the basics.
How long did you hold 20 psi during your Boost Leak Test?
What kind of Spark Plugs are in the vehicle?
What is the resistance of both the primary and secondary coils on the coil pack?

 

[MrGriff750]

finally took it to the mechanic and he discovered that the timing belt was put on incorrectly...the cam gear and balance shaft were set wrong. Also on 1 of my ecu capacitors the solder on the bottom of it looks burnt. Im goin to replace the capacitor with a set i found online. If thats not the problem i am going to replace the entire ecu.

 

[MrGriff750]

The problem all along was the ecu caps. I checked them before but obviously didnt look hard enough. My balance shaft is still off tho. Ive checked around and havent found a way to easily adjust it. Anybody got any know-how?