HELP! major hesitation problems.
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HELP! major hesitation problems.
whenever i apply the throttle, the engine hesitates/stutters badly until the rpms go up a few thousand. my tps is set, and i cant find any vac leaks. i sprayed starter fluid around the manifolds and stuff, everywhere where i thought there could be a vac leak. vacuum at idle (1300 rpm) is 19 in/hg. could this be a grounding problem? clogged primary?
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i checked all the grounds, they seemed good. the problems started after i removed the rats nest and simplified the vac lines. i also had removed the lower manifold, and reused the old gasket with gasket sealer.
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I don't see a problem with reusing the gasket, hell I've done it more than once myself, as long as you don't have a leak...first thing that comes to mind: did you route the vac lines back correctly?, and second: are you sure you regrounded that terminal good? you would have had to remove the bolt securing it to remove the rat's nest...if ya want, read out pins 3A & 3G from the ECU to ground ('86-88) to see if it's any good or not...
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i dont have a fuel controller though, and i replaced the fuel filter to see if it would help, but it didnt. could it possibly be dirty primaries then? i used slightly smaller diameter fuel lines though. now that i think of it, i was cleaning the secondary fuel rail, and i blew it out with some air, could that have damaged the regulator? i wouldnt think it would affect anything though, as it runs fine after the rpms get up to about 2-3k
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Using test lights or voltage at idle readings will get your idle setting perfect, but you could still have a worn out TPS resistor.
-The golden test:
Pull the TPS connector off.
Get an analog (needle type) VOM set to the 1K scale.
Connect it to the pins for the orange & green wires.
Open the throttle enough so you can test the TPS plunger through its full stroke.
As you work the TPS plunger in & out, the meter needle must swing smoothly from ~0 to ~5K ohms.
As the TPS wears, it can give non-linear or inconsistent signals to the ECU.
A worn out TPS may give 1K ohms at idle, but have a drop out or short further up the scale.
A drop out at mid scale will tell the ECU to idle at that point & give a fuel cut hesitation.
I had one go open at the top which made the S5 ECU go nuts, giving random fuel cuts.
-The golden test:
Pull the TPS connector off.
Get an analog (needle type) VOM set to the 1K scale.
Connect it to the pins for the orange & green wires.
Open the throttle enough so you can test the TPS plunger through its full stroke.
As you work the TPS plunger in & out, the meter needle must swing smoothly from ~0 to ~5K ohms.
As the TPS wears, it can give non-linear or inconsistent signals to the ECU.
A worn out TPS may give 1K ohms at idle, but have a drop out or short further up the scale.
A drop out at mid scale will tell the ECU to idle at that point & give a fuel cut hesitation.
I had one go open at the top which made the S5 ECU go nuts, giving random fuel cuts.
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