MrAnderson
NAXJA Forum User
- Location
- Arroyo Grande, Ca
2000, ATK 4.0 reman < 3k, 161k, auto
Hello,
Had a thread on this already but due to finals at school and moving and yada yada had to abandon it for awhile. Now its back to it. Im able to bike to work so the ol heep's sitting comfy in a garage ready to be worked on.
Anyways, a lil back story, my old motor had a case of the piston slap so i got her a $$new one$$(kinda wish i had ol ticky back now ). worked out a few lil things with the new motor and now its running fine EXCEPT on a cold start. and when i say cold start i mean it, like even if its a hot day it wont do it.
I will go to start her up and it fires up fine, runs clean for about a second or two and then goes into a shuddering that sways the jeep side to side for about 10 seconds and then goes away. AND THATS IT. nothing else odd or strange will happen until the motor has FULLY cooled back down, usually from leaving it overnight or parking it at work for 8 hrs and getting off at 10pm, upon which it will produce the same effect
initially i suspected a leaking injector and have replaced two now with no change. doing this showed me that if i flash my comp the "misfire" will go away for a few days giving me the indication that ive fixed the issue and then crushing my joy later haha. i havent ruled out that it may be the cause.
i currently have a fuel pressure kit hooked to it and im at 9.5 with the key on ON and what appears to be 48ish and makes it way to 49 after awhile. as far as i can find my pressure should be at 5 on idle not 10? but as for the running idle its normal. could that initial high pressure be shoving to much gas in it on start up? ill be investigating and testing this further for now. possibly new a new reg or have a kink in the line
my next plan is replace the map and see if that does anything and also acquire a vac gauge and see whats going on with that.
thank you as always
Hello,
Had a thread on this already but due to finals at school and moving and yada yada had to abandon it for awhile. Now its back to it. Im able to bike to work so the ol heep's sitting comfy in a garage ready to be worked on.
Anyways, a lil back story, my old motor had a case of the piston slap so i got her a $$new one$$(kinda wish i had ol ticky back now ). worked out a few lil things with the new motor and now its running fine EXCEPT on a cold start. and when i say cold start i mean it, like even if its a hot day it wont do it.
I will go to start her up and it fires up fine, runs clean for about a second or two and then goes into a shuddering that sways the jeep side to side for about 10 seconds and then goes away. AND THATS IT. nothing else odd or strange will happen until the motor has FULLY cooled back down, usually from leaving it overnight or parking it at work for 8 hrs and getting off at 10pm, upon which it will produce the same effect
initially i suspected a leaking injector and have replaced two now with no change. doing this showed me that if i flash my comp the "misfire" will go away for a few days giving me the indication that ive fixed the issue and then crushing my joy later haha. i havent ruled out that it may be the cause.
i currently have a fuel pressure kit hooked to it and im at 9.5 with the key on ON and what appears to be 48ish and makes it way to 49 after awhile. as far as i can find my pressure should be at 5 on idle not 10? but as for the running idle its normal. could that initial high pressure be shoving to much gas in it on start up? ill be investigating and testing this further for now. possibly new a new reg or have a kink in the line
my next plan is replace the map and see if that does anything and also acquire a vac gauge and see whats going on with that.
thank you as always