Slapperbar
Retired Navy NDT Examiner
Ignition Module.
CK5
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Diagnostic Now....Broke XJ shaft, melted rotor. Cause?
- Thread starter dhcomp
- Start date
randy88k5
1/2 ton status
I'm curious about the slow cranking. I would run a compression test on each cylinder to see if you can spot any problems there.
big pappa b
3/4 ton status
Are you getting spark to the plugs? Coil or module
Very fair, but normally the first thing i've seen fail on the ign module is the injectors.
Really stabbing in the dark until i check for spark tonight.
Thanks guys!
Ok. Fuel, spark.
Checked TDC, pointed to plug 1, no timing chain issues.
Swapped ign module, for the hell of it. No change.
Turns over full speed, spits, stumbles, doesn't start. Hesitant to mess with timing since it was running....
Tips? Working on it right now...
Checked TDC, pointed to plug 1, no timing chain issues.
Swapped ign module, for the hell of it. No change.
Turns over full speed, spits, stumbles, doesn't start. Hesitant to mess with timing since it was running....
Tips? Working on it right now...
What's the condition of the cap/rotor/plugs/wires? Sounds like it's trying but not getting enough firepower...
What's the condition of the cap/rotor/plugs/wires? Sounds like it's trying but not getting enough firepower...
Oh, and swapped coil too. Distributor is new, plugs are fairly new, so are wires.
It died on the freeway when it was running find, and won't restart if that helps...
Have you gotten the ecm tested? Otherwise I'm stumped...
Actually, I just thought of something. Is your exhaust plugged up? If your cat blew up and clogged the system it could do this I suppose.
y5mgisi
1 ton status
Do you have a timing light? Might try seeing what the timing is while trying to start. Is it spitting back out the throttle body at all? Cause that's a dead giveaway that It's a timing issue.
I do have a timing light, but no idea what it is while trying to start. Yes, spitting a bit, backfired once. But, how would the timing have changed suddenly, unless it skipped a tooth? It ran fine. Was hesitant to mess with the timing because of it running fine before it quit. But really, that is probably the next thing.
Moved the plug wires over one wire to make sure it wasn't in a wierd spot, and it did nothing.
ECM was new a couple months ago, delco unit...but could still be bad. No codes to read, after disconnecting the battery...but it does go through its self check and flash 12.
Moved the plug wires over one wire to make sure it wasn't in a wierd spot, and it did nothing.
ECM was new a couple months ago, delco unit...but could still be bad. No codes to read, after disconnecting the battery...but it does go through its self check and flash 12.
y5mgisi
1 ton status
The only thing i can keep going back to in my mind(not that im the smartest cat on here) is that if its backfiring out the TB, at least one of the two timings are off. Thats valve timing(plug firing off the airfuel as the intake valve is still open when it shouldnt be). Or Ignition timing(intake valve still open when the plug fires when it shouldnt). Perhaps you could disconnect the timing wire and use your timing light while remote starting the truck to verify where it is. Cause if its off and your distributor didnt move cause its tight, then the chain skipped which then effects also the ignition timing down stream. Aside from that, if your ignition timing checks out good, you will have to check your compression. I believe autozone rents them out if you dont have one.
This may not help, but I swear I think I am going to start a pad like the "get a pregnancy test" one that is running around.
Its going to say "Change your ignition module".
In the past couple of weeks, I have seen that fix low power, failure to start, rough idling, just about everything you can imagine.
If its malfunctioning, and firing when it shouldn't, then it could cause the backfire and failure to run.
A timing light might show it by having the timing mark jumping around, but it would depend on how its acting.
Its going to say "Change your ignition module".
In the past couple of weeks, I have seen that fix low power, failure to start, rough idling, just about everything you can imagine.
If its malfunctioning, and firing when it shouldn't, then it could cause the backfire and failure to run.
A timing light might show it by having the timing mark jumping around, but it would depend on how its acting.
Oh, and you can pull the oxygen sensor out of the pipe to check for a stopped up cat. Usually it just causes severe loss of power, but it might give your symptoms.
With the O2 sensor out, you should not feel much pressure at the hole when cranking. If it sounds like you are cranking with a sparkplug out, then something is stopped up.
With the O2 sensor out, you should not feel much pressure at the hole when cranking. If it sounds like you are cranking with a sparkplug out, then something is stopped up.
Changed the Ign module, no improvement.
Cat is new w/in the last few years, but i'll check it out. Really doubt it would suddenly clog and stop the truck.....
If your truck has one--the Fuel Pressure Regulator may have ruptured its diaphram,allowing gas to flood the intake to the point the plugs fouled,and wont fire now.....seen that happen more than once....pull off the vacuum hose on the regulator,if gas dribbles out,its junk....low fuel pressure can cause all kinds of weird run symptoms also...even a few PSI below specs can do it..
TheBeast_88K5
Banned
My "nephew", the one in Afghanistan, had a Jeep when he was at Ft. Bragg. It started running really bad, and just did not have any power.
He took it somewhere, and they checked it out and told him the engine was shot and would have to be replaced or rebuilt.
He called me, they all do, and I asked him the symptoms. Told him that it was very unlikely a bad engine.
He had some leave time, so he towed it all the way down here. We pulled the O2 sensor, and it was loud.
Took it off and put in a straight pipe. Ran like a top. Cut the cat open, and the honeycomb had cracked and a cone shaped piece went right into the ouput pipe.
Could not have fit better if it had been made for it.
But, it kept running even so. Not sure if it could be your problem or not.
Any chance the EGR valve stuck wide open?
He took it somewhere, and they checked it out and told him the engine was shot and would have to be replaced or rebuilt.
He called me, they all do, and I asked him the symptoms. Told him that it was very unlikely a bad engine.
He had some leave time, so he towed it all the way down here. We pulled the O2 sensor, and it was loud.
Took it off and put in a straight pipe. Ran like a top. Cut the cat open, and the honeycomb had cracked and a cone shaped piece went right into the ouput pipe.
Could not have fit better if it had been made for it.
But, it kept running even so. Not sure if it could be your problem or not.
Any chance the EGR valve stuck wide open?
