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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
I have a 94 Cherokee that I bought with a bad engine from an auction. It ended up having to be rebuilt so I rebuilt it. Now with it together again and pretty sure that all the sensors are hooked ul correctly it won’t start. Replaced coil, crank pos sens, plugs, distrib cap and distrib rotor. It seems to backfire through the throttle body when cranking. Have fuel pressure with and without vacuum hose New injectors, tested pigtails with noid light and all but #6 is firing. Frustrated and hoping for help thanks!
Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
Pay very close attention to the location of #1 on the distributor. That's where Chilton & Haynes are wrong, and it has tripped up many of us. I'd say there's about a 99% chance that's where your problem is.
Pay very close attention to the location of #1 on the distributor. That's where Chilton & Haynes are wrong, and it has tripped up many of us. I'd say there's about a 99% chance that's where your problem is.
where is the Haynes wrong and what is the right way?
You can rotate the engine to TDC #1 cylinder (compression stroke, not exhaust) and make the rotor point to the #1 contact. There should be a 1 on the cap somewhere.
Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
Originally Posted by OscarMcMahan
where is the Haynes wrong and what is the right way?
Cruiser posted the correct diagram. If you compare than to Haynes you should see the error. Again, it's not in the ORDER, it's where they start on the distributor.
You can rotate the engine to TDC #1 cylinder (compression stroke, not exhaust) and make the rotor point to the #1 contact. There should be a 1 on the cap somewhere.
It was 180 degrees out. Smh
I’m we got is started but turned it off after a few second as we haven’t put the coolant in yet
So the injectors have 12v constant to them when the key is in run or start. The ECU pulses ground to them. You either have a bad wire, connector, or a bad ECU. I have seen an injector transistor on the ECU give up before. I was able to repair it by soldering on a new one, but it takes some fancy soldering skills. You most likely just have a broken wire somewhere.
So the injectors have 12v constant to them when the key is in run or start. The ECU pulses ground to them. You either have a bad wire, connector, or a bad ECU. I have seen an injector transistor on the ECU give up before. I was able to repair it by soldering on a new one, but it takes some fancy soldering skills. You most likely just have a broken wire somewhere.
Is there any way you recommend to test for these various problems?
Do a visual inspection of the wiring and use a multimeter to determine if you're getting +12v or not. If you're not getting +12v, trace it back to the splice. If you are, check continuity of the trigger wire going back to the ECU.
Do a visual inspection of the wiring and use a multimeter to determine if you're getting +12v or not. If you're not getting +12v, trace it back to the splice. If you are, check continuity of the trigger wire going back to the ECU.
A bit of work but you can also swap #6 to another position and see if the problem move with it. You can also apply 12v to the injector directly and hear if it clicks. I know you said you have new injectors but "stuff happens".
Yeah, check the wiring and swap injectors or injector connectors to see if the problem moves. If those "new" bosch injectors were under $80 for the set, they are most likely fake chinese knockoffs. Those are notorious for problems including poor patterns, mismatched flow rates, and dead out of the box.
So the injectors have 12v constant to them when the key is in run or start. The ECU pulses ground to them. You either have a bad wire, connector, or a bad ECU. I have seen an injector transistor on the ECU give up before. I was able to repair it by soldering on a new one, but it takes some fancy soldering skills. You most likely just have a broken wire somewhere.
did the break in 20 min and it seemed to run fine
the injector had 12 to it so pretty sure it’s fine
09-29-2021, 09:40 PM
Cranks but no start. Fuel good, spark good,
