98 "ZJ" Starts & dies twice, then starts and runs fine (where do I start?)
Update as of 5/15/2015:
Replaced front and rear O2 sensors
Cleaned fuel rail/injectors
Fuel pump replaced and tank cleaned
Fuel pump replaced again (first one was defective - delphi from Autozone)
pulled plugs to check them, 6 clean & normal. #4 was wet with gas, #6 was covered in carbon
Checked plug wire routes... yep, PO had 4&6 crossed. Runs better, backfiring gone. I think still has starting issue
has new plugs/wires/cap/rotor
fuel is fresh
No engine light, no codes
like title says my "ZJ" starts and dies twice then starts and runs fine. I haven't started diagnosis yet, just looking to see if there is something common to look for. I searched but didn't really have any luck.
I have one code P0141 : O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
I recently replaced the fuel pump and will be checking fuel pressure
I've seen ZJs start/run/die (and not start) due to failing/failed battery
current update. When I checked fuel pressure it was high, like 60-62 psi. I also found there was a bunch of fuel in the oil... I noticed it had been running rich, didn't realize it was that bad. (some back story: I had replaced the fuel pump/sending unit because the original basically deteriorated and there was a bunch of trash in the tank that I had to clean out)
So what I did so far was change the oil. And I removed the fuel rail and injectors to clean them and make sure there was no trash that got up there. Test injectors too.
So I got that all done and forgot to plug in the IAC and couldn't get it to idle.... plugged in the IAC and it still won't idle.... and thats where I'm at today. I'll pull the IAC and see if it got stuck or is gunked up with crap
Definitely going to try unplugging the O2s as suggested. Thanks for the help/advice so far
lets see, updates so far (this jeep is my toy, so I only work on it when I have time)
Replaced both O2 sensors
Cleaned fuel rail/injectors
The problem with IAC was fixed by unhooking battery for awhile
Had to replace my replacement fuel pump... FPR was bad (I bough Delphi @ autozone... SHOULD have gotten OEM. If this one has problems I will get OEM)
I still have the starting problem... looks like next on the list is a new battery (this one is at least 5 years old)
ok replaced the battery and still having issues. It's still hard to start. idles, runs, & drives fine. it does "backfire" slightly out the exhaust under heavy throttle.
So I'll need to check fuel pressure again... I'm going to be real pissed if this fuel pump is defective as well. thanks in advance for any other suggestions, I'd like to get all the kinks worked out of this thing
had a minute at lunch today.... checked plug wire routes... yep the PO had #4 and #6 switched around. Runs a hell of a lot better now! I think I still have the starting issue... but I'll have to report back on that
1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ Platinum Limited 5.9, Backyard parts fodder
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style
Originally Posted by Texas ZJ1
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.