hi all
today i have a special question, it´s not my Eagle. i bought a 1994 Grand Cherokee 4.0.
@Admins
if it´s not ok, you can delete my question
last week i bought a 1994 Grand Cherokee 4.0.
the old owner says: only the alternator and one spark plug wire is dead.
ok, today i change the alternator and the spark plugs, rotor distributor cap and spark plug wires.
i start the engine and the volt-meter says only 12V
i open the fuse box and the 2 fuses with 60A was blown.
so i change the fuses and start again, ok, the alternator is now working.
But the engine runs only on 5 cylinders and smokes like heck and the fuel is dripping out of the exhaust.
a friend of mine says: hole in piston
i don´t think so.
i pull of the spark plug wire from the 5th cylinder is no change and i dont have seen any spark springing around :'(
when i accelerate over 2000 rpm i think all 6 cylinders works.
and one time, the engine runs in idle, the engine shut off.
i will start again, no reaction.
i can not hear the fuel pump.
so i disconnect the batterie, wait a little, connect the batterie again, switch on ignition an the fuel pump works again and the engine starts.
can it be the crankshaft position senson or a another sensor ?
or the engine dead ?
i think here in the Eagle Forums finds a lot of members with this engine
thanks
thanks for all ideas
I would say to do a compression check. If one of the cyls is low, next would be a leak down (cylinder differential pressure) test. The leak down test will show where the problem is. If air is heard in the intake, an intake valve is bad. If in the exhaust, then an exhaust valve is bad. If air is heard in the crankcase (through oil fill), then you have either bad rings or a hole in a piston (as others have suggested).
hmm, a lot of things to check.
only one idea: it is possible that injector nr5 are permanently open and this is the reason for the overflow ?
Injector could be faulty, swap it with another cylinder and check if the problem moves.
And a compression test of course...
compression test is done, full power on all 6 friends ;D
i read in the book, the camshaft position sensor, located in the distributor.
if its posible that thing will not work correct ?
blinking trouble codes
12
55
nothing what have to do with my problem :lurk:
Bad injector is flooding the plug and snuffing the spark.
Check all the fuses, especially the little tiny ones under the hood. They power all kinds of sensors. Follow the wiring harness around and look for breaks and wear.
Though maybe not the problem, I would worry that part of the injector harness is shorting out.
thanks all for the help
tomorrow, when i find time, i will check the fuses and harness.
after this, when nothing is to see, i pull out all injectors with the rail >:(
The story continues....
You can also try dumping a WHOLE can of Sea Foam in the gas tank, see if that loosens up the stuck injector, if that's the problem, also add some to the oil, it works wonders in there
I think you have an electrical problem. You said you are not getting any spark to that cylinder. Are your spark plug wires in good condition. As casper suggested, check the trigger wheel inside the distributor.
today i had no so much time.
i check all fuses, all ok.
spark plug test on all 6 ok. sparks very good, also on 5
when i pull of the electrical connector from injector 1-4 the engine goes down with rpm´s also on cyl 6, but no changes on cyl. 5.
electrical or mechanical fail ?
today comes a guy and says: aaah white smoke, your head gasket are blown, miss the engine water ?
i say no, the water is ok and the compression is also ok on all 6
the guy says: aah, then must you have water in the oil...
i say, no..no water in oil, the oil have on a fuel smell
the guy says: aah you have a fuel problem
i say: i know :banghead:
Too funny - good luck.
Quote from: el-camino on October 26, 2011, 03:25:44 PM
spark plug test on all 6 ok. sparks very good, also on 5
when i pull of the electrical connector from injector 1-4 the engine goes down with rpm´s also on cyl 6, but no changes on cyl.
Sounds like the injector is stuck open then. Have you checked the number 5 spark plug tip, it would probably be full of carbon from running extremely rich.
thanks casper,
today i find time to do the electrical tests on the injectors.
14,4 Ohm on all 6, thats great.
the next test was 12v on the injectors, the click test.
all 6 injectors clickin fine ;)
tomorrow i will check the rest..... ???
Odd question here, But have you tried to just pull the injector and put it in a bucket and start the engine? You should be able to tell if it is open full time or not.
ok, i don´t know why, but now comes the code :hello2:
code number 27
Injector 3, and/or 4, and/or 5, and/or 6 output driver does not respond properly to the control signal.
whats going on ? ???
just now i´m ready with the blink-test on the injector connectors.
Cylinder 1 -4 are blinking
not so cylinder 5 + 6
the test light is on but not flashing.
i checks the wires from the PCM to the injector connectors, the wires are ok.
and now ? bad PCM ?
ugh, sounds very suspect.
Did you make sure that the injectors are receiving 12 volts when the key is on/running? The PCM should only ground the injectors, so make sure that the injectors have power before replacing the PCM.
thanks all.
i will check this tomorrow morning, but i think the injectors have 12V with ignition on.
but i check it again.
i´m a little confused.
when this 2 injectors become not a impulse (Ground) they are closed.
the fuel in the exhaust makes me crazy.
tomorrow morning i remove the fuel rail with the 6 injectors to inspect this crazy things.
the last test is done. ;)
i pull out the injectors with the fuel-rail and go to ignition.
from injector 5 + 6 comes full power fuel, the other 4 are ok.
the next step, i pull of the electrical connectors from injector 5 and 6 and go to ignition.
now are all 6 injectors ok.
fail signal from PCM ? ???
That is a smart test.
Looks like a motor management failure.
Can you swap connectors or swap injectors to find out where the fault is?
Jurjen
yesterday i have tested the connectors from the injectors
Cylinder 1 -4 are blinking
not so cylinder 5 + 6
the test light is on but not flashing: no ground signal
i check also the wires from the PCM to the injector connectors, the wires are ok.
tomorrow i swap the connectors to have 100% points ;)
today i plug the "new" PCM, YES :blob1:
the engine runs smooth and sounds good.
only one new code: 31
EVAP canister purge solenoid i think , i check it tommorow
thanks all for the help ;D
good news!
Good to hear. It's nice to get to the root of the problem without having replaced things that aren't broken.