hesistation issues
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hesistation issues
so my car started to have the 3800 hesitation, then it just started running flat ( no power at all) so i did some searching and redid the grounds on the batt terminals, eyelet, boost sensor, still had both issues, then i changed and adjusted my tps, that took away my flatness but i still had the 3800 stall, so reground the ecu at the ecu per the pinout in the fsm, not once it gets warm i can't apply any power in any gear above 2nd ( no power, backfires, drinks gas) . so i removed the ground wires, still have the problem, anyone know what i have missed?
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ECU ground under the intake.
http://www.aaroncake.net/RX-7/grounding.htm
http://www.aaroncake.net/RX-7/grounding.htm
#6
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um...clogged catalytic converter could be the culprit of the lack of power.
The hesitation can be fixed with the addition of 8gauge ground wires....ground the manifold to the chassis and such...also, check and make sure your transmission ground is still connected to the firewall...
The hesitation can be fixed with the addition of 8gauge ground wires....ground the manifold to the chassis and such...also, check and make sure your transmission ground is still connected to the firewall...
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um...clogged catalytic converter could be the culprit of the lack of power.
The hesitation can be fixed with the addition of 8gauge ground wires....ground the manifold to the chassis and such...also, check and make sure your transmission ground is still connected to the firewall...
The hesitation can be fixed with the addition of 8gauge ground wires....ground the manifold to the chassis and such...also, check and make sure your transmission ground is still connected to the firewall...
thanks
Dennis
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update, the car now instead of richening out leans out but about at the same time, 1/2 throttle. any ideas as to why it might be doing this?
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update: car still richens or leans out after it gets warm and sputters, since last post i have
cleaned the injectors
changed all engine sensors but the afm and ecu
fixed and added a ground at the starter: (my alternator voltage is now 13-14 volts or so, b4 it was barely 12)
changed the spark plugs
re-wired the fuel pump
not sure if i said this but the engine is a rebuild with 1300 miles on it and streetported, did a compression test to see how much compression i had built so far
90 psi front
70 psi rear
and just for giggles and advice from a riend of mine that is a mechanic i unplugged my 02 sensor, it ran exactly the way it had been with it plugged in and didn't throw and codes either, maybe the wire to the ecu needs to be replaced?
thanks for any help
Dennis
cleaned the injectors
changed all engine sensors but the afm and ecu
fixed and added a ground at the starter: (my alternator voltage is now 13-14 volts or so, b4 it was barely 12)
changed the spark plugs
re-wired the fuel pump
not sure if i said this but the engine is a rebuild with 1300 miles on it and streetported, did a compression test to see how much compression i had built so far
90 psi front
70 psi rear
and just for giggles and advice from a riend of mine that is a mechanic i unplugged my 02 sensor, it ran exactly the way it had been with it plugged in and didn't throw and codes either, maybe the wire to the ecu needs to be replaced?
thanks for any help
Dennis
#12
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02 has no relation to your problem at all. None.
It sounds like you grounded the wrong wires on the ECU imho.
Post a jpg of the ECU plugs and point to the wires you added a gnd to. By jpg, I mean a page out of the FSM showing the pinout of the ECU plugs.
It sounds like you grounded the wrong wires on the ECU imho.
Post a jpg of the ECU plugs and point to the wires you added a gnd to. By jpg, I mean a page out of the FSM showing the pinout of the ECU plugs.
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the car is at home and im at school so i can't double check which wires i regrounded. but by the pinout im pretty sure 2r 3g and 3a
Dennis
Dennis
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yes it is, out of spec.
Check your injector resistance
check to make sure all injectors are getting power when the key is on(check continuity between the positive lead on the harness and a chassis ground)
check your pressure sensor on the passenger shock tower, injectors switching on is also dependant of inputs from that sensor, check it out according to the fsm and check the continuity of the wiring.
have the injectors been serviced?
Check your injector resistance
check to make sure all injectors are getting power when the key is on(check continuity between the positive lead on the harness and a chassis ground)
check your pressure sensor on the passenger shock tower, injectors switching on is also dependant of inputs from that sensor, check it out according to the fsm and check the continuity of the wiring.
have the injectors been serviced?
#16
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yes it is, out of spec.
Check your injector resistance
check to make sure all injectors are getting power when the key is on(check continuity between the positive lead on the harness and a chassis ground)
check your pressure sensor on the passenger shock tower, injectors switching on is also dependant of inputs from that sensor, check it out according to the fsm and check the continuity of the wiring.
have the injectors been serviced?
Check your injector resistance
check to make sure all injectors are getting power when the key is on(check continuity between the positive lead on the harness and a chassis ground)
check your pressure sensor on the passenger shock tower, injectors switching on is also dependant of inputs from that sensor, check it out according to the fsm and check the continuity of the wiring.
have the injectors been serviced?
#20
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If you rewired the pump and are using a walbro 255 on an NA, you're way rich. I know this personally. My '90 NA hesitated after I replaced my stock pump with the walbro. Rich mixtures can cause lack of power just like it did on mine. I had 44 PSI fuel pressure at idle with the walbro and the resistor pack. Without the resistor, you are probably approaching 50 PSI at idle. Even higher under accel due to the FPR. This is way way way too rich. As soon as I went to a stock pump my pressure came down to about 29 where it should be and my power and mileage went back up to normal. Do what I did and save your walbro for a TII or sell it to someone that owns one. It's a good idea to invest in a good quality fuel pressure gauge and tee fitting. This applies to anyone with hesitation or low power symptoms. There are several possible causes for this, and low or high fuel pressure is just one.
Last edited by scrip7; 11-06-07 at 02:55 AM.
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