2stix
NAXJA Forum User
- Location
- fallbrook Ca.
completely stock 89 wagoneer, 4.0, auto, 242.
when i start the engine it revs high as normal, (maybe a little to high at the moment at 2000rpm), then comes down to normal maybe 700 rpm, but in 1 - 2 sec intervals it continues to lower untill barely able to idle. like the timing is being retarded to the point it almost wont run.
i have been reading every thread possible about it and have tried what i think is about every check i know of.
the exhaust has a new muffler but no cat at the moment untill i make sure it is running correctly and not rich.
new 02 sensor (tested good), new TPS (tested good, and set at .83 volts with 4.91 volts input), new CTS, cleaned IAT sensor (tested good), MAP sensor (tested good and even tried a spare), new stepper motor and working properly, cleaned all factory grounds and tested good, added extra ground as per recommended by every darn site i can find, new distributer and pulse generater, new cap and rotor, new plugs, new timing chain set, cleaned all the injectors (had an extra set from another jeep and used the best 6 out of 12), new EGR valve, CPS tested good and no trouble starting. it actually is testing higher voltage than normal since i modified it to sit a tad closer to the flex plate. tried swapping ECU from my 87 parts jeep with no difference. i know i am forgetting a bunch of stuff, but my brain is fried right now and very very very frustrated. i have been attacking this thing for the past 3 weeks and have read as much as i could and tried everything i can think of to remedy the low idle. every sensor and electrical connector i can find has been cleaned and tested. fuel pressure is at 30 psi and holds well. every vacuum line i can find has been checked and or replaced. i have checked for vacuum leaks and didnt find any. vacuum tests out around 15. swapped around the 4 relays, and even replaced them with others.
what all controls the ignition timing? i seem to have gotten this thing to run smooth and nice for a few seconds, then as the idle lowers it starts running worse. to me it seems like the timing is being retarded, atleast that is what it is acting like. a lack of power when on test runs. it runs smooth and shifts good, but i know it is lacking power. during some of the testing and such i found that if while running i disconnect the TPS and reconnect it, it will raise the idle to normal. when i test run it the thing runs great and has its power back. as soon as i shut it down and restart it, the problem exists again.
and befor you say to post all the numbers i got from all the testing of all the sensors, i have basically tossed em all in frustration and am at my wits end. but be sure they all tested within specs as per FSM and info from here or other sites.
if you can think of something to try, please post it and i will see if i have done it or will try it. thanks....
when i start the engine it revs high as normal, (maybe a little to high at the moment at 2000rpm), then comes down to normal maybe 700 rpm, but in 1 - 2 sec intervals it continues to lower untill barely able to idle. like the timing is being retarded to the point it almost wont run.
i have been reading every thread possible about it and have tried what i think is about every check i know of.
the exhaust has a new muffler but no cat at the moment untill i make sure it is running correctly and not rich.
new 02 sensor (tested good), new TPS (tested good, and set at .83 volts with 4.91 volts input), new CTS, cleaned IAT sensor (tested good), MAP sensor (tested good and even tried a spare), new stepper motor and working properly, cleaned all factory grounds and tested good, added extra ground as per recommended by every darn site i can find, new distributer and pulse generater, new cap and rotor, new plugs, new timing chain set, cleaned all the injectors (had an extra set from another jeep and used the best 6 out of 12), new EGR valve, CPS tested good and no trouble starting. it actually is testing higher voltage than normal since i modified it to sit a tad closer to the flex plate. tried swapping ECU from my 87 parts jeep with no difference. i know i am forgetting a bunch of stuff, but my brain is fried right now and very very very frustrated. i have been attacking this thing for the past 3 weeks and have read as much as i could and tried everything i can think of to remedy the low idle. every sensor and electrical connector i can find has been cleaned and tested. fuel pressure is at 30 psi and holds well. every vacuum line i can find has been checked and or replaced. i have checked for vacuum leaks and didnt find any. vacuum tests out around 15. swapped around the 4 relays, and even replaced them with others.
what all controls the ignition timing? i seem to have gotten this thing to run smooth and nice for a few seconds, then as the idle lowers it starts running worse. to me it seems like the timing is being retarded, atleast that is what it is acting like. a lack of power when on test runs. it runs smooth and shifts good, but i know it is lacking power. during some of the testing and such i found that if while running i disconnect the TPS and reconnect it, it will raise the idle to normal. when i test run it the thing runs great and has its power back. as soon as i shut it down and restart it, the problem exists again.
and befor you say to post all the numbers i got from all the testing of all the sensors, i have basically tossed em all in frustration and am at my wits end. but be sure they all tested within specs as per FSM and info from here or other sites.
if you can think of something to try, please post it and i will see if i have done it or will try it. thanks....