what are the signs of low compression?
06-02-04, 09:32 PM
#3
slowmotion
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my cars idle is really messed up...sometimes it stalls for no reason..other times it stays around 750 but bounces a lot...sometimes it goes to around 1100...and sometimes when i put it in neutral to come to a stop ..instead of just dropping to 750, its like it cant hold itself up and it stalls..its weird. what does that mean?
(again, i would of search for it...but its not working for me...sorry)
(again, i would of search for it...but its not working for me...sorry)
06-02-04, 09:50 PM
#6
slowmotion
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my cars idle is really messed up...sometimes it stalls for no reason..other times it stays around 750 but bounces a lot...sometimes it goes to around 1100...and sometimes when i put it in neutral to come to a stop ..instead of just dropping to 750, its like it cant hold itself up and it stalls..its weird. what does that mean?
(again, i would of search for it...but its not working for me...sorry)
(again, i would of search for it...but its not working for me...sorry)
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06-03-04, 06:18 AM
#20
Seduced by the DARK SIDE
Join Date: Apr 2001
Location: Orange Park FL (near Jax)
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I searched & found this:
this is in no way a complete guide to idle problems, but just how to fix certain problems based on what I have done to my car to get it running perfect at idle. Here goes:
Looping idle____________
99% of the time "looping idle" , or jumping idle is caused by the following:
Vacuum leaks. This is number 1! These cars are very old and prone to developing leaks. Check and check again for leaks. Check Intake manifold, intake piping, and the EGR
The other cause is the TPS sensor. Be sure to set the TPS when the car is at full operating temperature.
Bad idle speed_______________
If you idle speed is incorrect IE too low or too high, you should try to adjust it. Here’s how:
First, Warm the car up, check your TPS sensor adjustment.
Next, Jumper the initial set connector (green socket on drivers side fender near ignition coil with 2 connetors)
Start car up. If the idle is smooth with jumper in. pat yourself on the back. thats an easy fix. If it does NOT smooth out, proceed to check for vacuum leaks.
While the initial set jumper is in, set your timing to spec. Adjust your idle speed to 700-800 rpm.
Adjust your variable resistor (mixture settings) until the engine is idling as smooth as it can. Re-adjust idle speed back to 750-800 rpm.
Now is a good time to check your timing. Check and adjust your timing, then repeat the above steps to get idle speed back to 750-800 rpm.
Remove initial set jumper. You're done.
Do all this first to verify your idle setting are correct.
If after you pull the initial set jumper the car begins to have a surging idle again, the culprit is probably a clogged/bad BAC. remove your BAC, clean it well with carb cleaner. Reinstall the BAC and try again.
Idle speed wont hold after adjusting idle speed_____________
Try resetting the idle again, but set it with engine on full load. adjust the BAC and idle mixture with all your lights on and the AC on, it helped alot with mine.
If i tried to set mine with no load it would do a fine 750 idle with the initial set jumper in, but when i pulled it, it would creep back up to 1200-1300 rpm with no load.
Idle rough at load/ with AC on_____________________
Same as above. Set idle with engine at full load with initial set coupler in. You might need to adjust your idle mixture by using the solenoid resistor which is on the passenger side right by the pressure sensor. You will have to remove the factory plastic covering the screw before you can adjust it.
Car will not idle under 1500 rpm_______________________
Vacuum leak vacuum leak vacuum leak. You have a vacuum leak. Check EVERYTHING. Start with the Intake manifold joints, intake piping, and the EGR which is prone to leaking.
One of those pages (from teamfc3s.org) mentions putting a 10k resistor in the BAC plug, and with the ignition ON but not started check the voltage across that resistor to see what the ECU is outputting. They say less than 5V is a Bad Thing.
this is in no way a complete guide to idle problems, but just how to fix certain problems based on what I have done to my car to get it running perfect at idle. Here goes:
Looping idle____________
99% of the time "looping idle" , or jumping idle is caused by the following:
Vacuum leaks. This is number 1! These cars are very old and prone to developing leaks. Check and check again for leaks. Check Intake manifold, intake piping, and the EGR
The other cause is the TPS sensor. Be sure to set the TPS when the car is at full operating temperature.
Bad idle speed_______________
If you idle speed is incorrect IE too low or too high, you should try to adjust it. Here’s how:
First, Warm the car up, check your TPS sensor adjustment.
Next, Jumper the initial set connector (green socket on drivers side fender near ignition coil with 2 connetors)
Start car up. If the idle is smooth with jumper in. pat yourself on the back. thats an easy fix. If it does NOT smooth out, proceed to check for vacuum leaks.
While the initial set jumper is in, set your timing to spec. Adjust your idle speed to 700-800 rpm.
Adjust your variable resistor (mixture settings) until the engine is idling as smooth as it can. Re-adjust idle speed back to 750-800 rpm.
Now is a good time to check your timing. Check and adjust your timing, then repeat the above steps to get idle speed back to 750-800 rpm.
Remove initial set jumper. You're done.
Do all this first to verify your idle setting are correct.
If after you pull the initial set jumper the car begins to have a surging idle again, the culprit is probably a clogged/bad BAC. remove your BAC, clean it well with carb cleaner. Reinstall the BAC and try again.
Idle speed wont hold after adjusting idle speed_____________
Try resetting the idle again, but set it with engine on full load. adjust the BAC and idle mixture with all your lights on and the AC on, it helped alot with mine.
If i tried to set mine with no load it would do a fine 750 idle with the initial set jumper in, but when i pulled it, it would creep back up to 1200-1300 rpm with no load.
Idle rough at load/ with AC on_____________________
Same as above. Set idle with engine at full load with initial set coupler in. You might need to adjust your idle mixture by using the solenoid resistor which is on the passenger side right by the pressure sensor. You will have to remove the factory plastic covering the screw before you can adjust it.
Car will not idle under 1500 rpm_______________________
Vacuum leak vacuum leak vacuum leak. You have a vacuum leak. Check EVERYTHING. Start with the Intake manifold joints, intake piping, and the EGR which is prone to leaking.
One of those pages (from teamfc3s.org) mentions putting a 10k resistor in the BAC plug, and with the ignition ON but not started check the voltage across that resistor to see what the ECU is outputting. They say less than 5V is a Bad Thing.
06-03-04, 06:30 AM
#22
Jesus is the Messiah
Originally posted by Adam
duct tape allways fixes my problems
duct tape allways fixes my problems
I can't garentee that they will work for your intended purpose (like a running engine) but I can garentee you wont have any problems with them! (unless you actually try to use them)
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