I have been battling with my jeep now for 3 days
Doing as much research as I could to nail down the problem but nothing is going my way
Recently I changed out rear bearings and axel seals due to a leak in the rear driver tire
Also replaced rear brake system because it was leaking
Did a hardware kit, new lines, and brake pads for the drums
I also replaced the fuel filter, double checked to make sure it was put on properly, in facing gas tank, out facing the front
Did a 1200km road trip no problems at all
Seemed like I had everything fixed when this damn jeep quit starting on me
Here are symptoms and what I have done thus far
2 days before the jeep finally quit starting
I started noticing it was taking longer to start each day, I mean really cranking it for a good 10-12 seconds and she fired. But was starting up finally with some difficulty. Engine would almost want to stall but it did go. After that first start of the day, no problems starting afterwards
When it finally quit, it would crank, starter going, battery had good charge
Just wouldn't fire up. I started checking the spark plug wires. No spark or hardly any. Next I checked the wire coming from ignition coil to distributor for resistance.
I had no reading at all sometimes, then it would fire a reading of .3-.5 ohms and I would get a bit of a jolt. Haynes book says at least .97 OHMS.
So yesterday I replaced the ignition coil. I'm getting a good reading now at the spark plug wires but it still won't fire
I should note that starter is AC Delco. Distributor cap and rotor, spark plugs, spark plug wires all replaced about 9-12 months ago.
I took out my old wires. Hooked them back up. Still won't fire up.
The other thing I have noticed is now, when I fire the jeep up. It almost wants to fire up but won't. You can hear the engine want to fire up but it won't go.
I can smell gas by the engine when I'm pumping the peddle to get it to go.
Checked fuse at the PDC, and under dash. No blown fuses
Not sure how to check relays.
I checked for codes yesterday as well
Got a code 12, code 33, code 41, code 51
I reset the computer today by pulling off positive cable for 20 minutes. Only have code 12 and 33 now
Jeep still won't fire up.
I have been reading my Haynes book like crazy and I'm headed back out to do more testing
Only thing I can think of is ignition module, PCM, and timing chain
All wires I have checked look in good shape and hooked up
So, now I'm turning to the forum for help as I'm to the point I have to go to a mechanic shop and let them fight with it
Anyone have some ideas or suggestions for what else I can try to narrow down the problem based on what I have been telling you??
Any help is appreciated as im ready to start pulling my hair out from the bs I've gone through.
so you have spark and fuel and air.....thats what you need to start a motor...so now you need to verify that you did not bump something loose while working on it. also check the crank positon and cam postion sensors. one is on the trans, the other in the distributor. chances are that since you can pull codes it is not the computer, but a sensor. im sure Que will see this and chime in as to anything i may have missed
Sorry if missed something cuz I just skimmed over it all, but did you test the pressure at the fuel rail? Not sure of the exact psi but should be at least 35 psi. Mine was having problems starting as well, then it came to the point where it would start, if at all, and just stumble and stall. My guess would be the fuel pump went bad on yours as did on mine. Seems I caught mine before it totally went as it was still starting sometimes.
A no start can definitely be caused by a bad fuel pump.
Oh and when mine was going, I only had 14 psi.
You have a good spark and air then I think fuel pressure (or delivery) is the problem, also. That the problem has been developing over several days makes me think that. Could be the fuel pressure regulator.
Senators and Congressman should wear uniforms like NASCAR drivers so we could identify their corporate sponsors....
If what doesn't kill you, makes you stronger, I should be able to bench press a Grand Cherokee by now!
Store didn't have any fuel pressure testers in stock till tomorrow morning
So, im going to keep testing electrical here
I'm guessing to check fuel pressure regulator, fuel tank has to be dropped??
Nevermind that question, just checked my Haynes/Chilton book to see it's in the throttle body assembly
I'm guessing though no ordinary tools can test that?
You can spray some starting fluid into the throttlebody to see if it cranks. If it does then its a fuel issue. You check fuel pressure at the fuel rail in the front by the throttlebody(Youtube has some general videos on how). If you see the CEL then the Capacitor should be good.
x2 with a probable fuel issue.
an easy way to check the fuel pump is to turn the key on for a few seconds then off for a few seconds, do that 4 or 5 times and then try to start it. by cycling the key on and off your building the fuel pressure up. if it fires up then dies your fuel pump isnt putting out the psi your motor needs
I would also check the Crank Position Sensor.. i fought with my jeep about a week ago and notice my starter was starting to smoke.. was under warranty so i went and got another one..also picked up a CPS, put them on and it fired right up.