Heavy hesitation problem/ power loss

[sganc4life_4]

IAT should be on ur throttle body, or along the intake tube.

[SLoe]

Hey Crow, here is some light reading for you . The rest is at vfaq comp primer

The ECU has several input sensors that help it determine the correct amount of fuel. The most widely recognized is the mass air flow sensor (MAS or MAF). The MAS consists of the air volume sensor, the intake air temperature sensor, and the barometric pressure sensor. These three sensors form a single component located directly behind the air filter, and it provides the ECU with the information required to calculate air mass.

[Why mass? Well, the ideal ratio of air to fuel depends on the number of molecules of each type of substance. Knowing the volume doesn't get you anywhere, since the number of air molecules in a given volume changes with temperature and pressure. If you know air volume, temperature and pressure, though, you can get air mass, which in turn can be used to determine the correct amount of fuel.]

So the input signals consist of the air volume, temperature and pressure from the MAS cluster. Feedback is provided by the oxygen sensor, located in the cars downpipe.

[Mr. Griff750]

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?

[Mr. Griff750]

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.

[Blackcrow64]

Originally Posted by loeman

Hey Crow, here is some light reading for you . The rest is at vfaq comp primer

Ahhh... Thank you very much, I actually feel smarter after reading all that now. lol

[SLoe]

Originally Posted by Mr. Griff750

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.

Did you ground the timing adjustment plug?

[SLoe]

Originally Posted by Mr. Griff750

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?

Did you check the resistance on your TPS?

[Mr. Griff750]

I did ground the timing adjustment plug and i also did check the resistance on the tps and i got weird readings

[SLoe]

Originally Posted by Mr. Griff750

I did ground the timing adjustment plug and i also did check the resistance on the tps and i got weird readings

What were your weird numbers?

[Mr. Griff750]

Update...replaced tps and problem still persists. Sigh...

[SLoe]

Why replace tps? You never told me what your numbers were. This is going to get expensive for you if you just go changing out parts without knowing for sure if they are bad. Did you follow up on my other theory? Unplug your MAS and see if the symptoms change.

[blk_srt]

not smart to randomly change things

[Mr. Griff750]

Well the tps was bad so it needed to be replaced. I'm not randomly changing parts. it fixed my jumpy timing problem.

[Mr. Griff750]

Problem fixed!! The whole time it was the capacitors in the ecu!! Thanks to everyone who helped.

[SLoe]