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87 wagoneer wiring problem

C

canopieman

NAXJA Forum User
Location
cabot,ar
i have a problem with the dist it is not getting any power to the dist. have power to the coil and dont know much about jeeps. i have a 97 it has power to one wire to the dist. was told it has a 96 4.0 in it and it has the 87 dist in it. any help hope someone can understand this
 
What I'm understanding is you have a 96 motor in your 87 and are concerned the sync sensor is not getting voltage? The sync sensor has three wires to it, the voltage in 7 volts, black ground and grey (with a stripe) signal out to the ECU.

For troubleshooting, unplug the sync sensor and leave it unplugged until you get the motor running. It will run without it and is sometimes hardly noticeable hwo well it runs with or without it.

What is your main issue? Won't start? Runs badly?
 
Note from DJ
This information may help you identify what the previous owner swapped into your Jeep
Block casting number location can be found hear in post # 2 by CJ7-Tim
http://www.jeepforum.com/forum/f11/4-0l-serial-number-location-995174/

Head casting number by years
It is easy to determine what head you have. On the driver’s side, about halfway down the cylinder head between #3 & #4 fuel injector but below the valve cover clean the lip of the head with a rag or solvent if really greasy. With a good light, you can read the casting number of the head.

Head casting number by years
Casting numbers are as follows:
Year............Casting No
1987-90......2686
1991-95......7120
1996-99......0630
2000-01......0331

Post back what you discover
 
It will not start it has no power to the wires that plug in to the dist. Just bought it and was told it ran and was running and would die. He changed the column and said it wouldn't do anything. We put a hot battery on it and everything works but no power to dist.
 
When you say no power to the distributor, do you mean no high voltage spark? Or no power to the three prong connector running to the distributor?
 
No power to the three prong connector. Checked it with voltmeter, then checked the wires back to the ecu and replaced the two wires to the ecu. It didn't have anything going to the 3 prong plug.
 
canopieman said:
It will not start it has no power to the wires that plug in to the dist. Just bought it and was told it ran and was running and would die. He changed the column and said it wouldn't do anything. We put a hot battery on it and everything works but no power to dist.
Click to expand...

That's not POWER to the distributor. It's an output to the eCU for injector firing. Your Jeep will run with that unplugged. Look elsewhere. Do you have a signal from the CPS?



Renix CPS Testing and Adjusting
　
　
Renix CPSs have to put out a strong enough signal to the ECU so that it will provide spark.
Most tests for the CPS suggest checking it for an ohms value. This is unreliable and can cause some wasted time and aggravation in your diagnosis of a no-start issue as the CPS will test good when in fact it is bad.
The problem with the ohms test is you can have the correct amount of resistance through the CPS but it isn’t generating enough voltage to trigger the ECU to provide spark.
Unplug the harness connector from the CPS. Using your voltmeter set on AC volts and probing both wires in the connector going to the CPS, crank the engine over. It won’t start with the CPS disconnected.
You should get a reading of .5 AC volts.
If you are down in the .35 AC volts range or lower on your meter reading, you can have intermittent crank/no-start conditions from your Renix Jeep. Some NEW CPSs (from the big box parts stores) have registered only .2 AC volts while reading the proper resistance!! That’s a definite no-start condition. Best to buy your CPS from Napa or the dealer.
Sometimes on a manual transmission equipped Renix Jeep there is an accumulation of debris on the tip of the CPS. It’s worn off clutch material and since the CPS is a magnet, the metal sticks to the tip of the CPS causing a reduced voltage signal. You MAY get by with cleaning the tip of the CPS off.
A little trick for increasing the output of your CPS is to drill out the upper mounting hole to 3/8" from the stock 5/16", or slot it so the CPS bracket rests on the bell housing when pushed down. Then, when mounting it, hold the CPS down as close to the flywheel as you can while tightening the bolts.

　
　
Revised 01-26-2013
 
You may not be getting any power to the ECU, yellow wire pin B-7 (I think) and red wire pin B-8 ( I think) a yellow and red wire right next to each other. The yellow wire turns on the ECU when the key is turned to run and/or start and the red wire supplies main voltage (from a fusible link next to the stater relay).
 
cruiser54 said:
　
Renix CPSs have to put out a strong enough signal to the ECU so that it will provide spark.
Most tests for the CPS suggest checking it for an ohms value. This is unreliable and can cause some wasted time and aggravation in your diagnosis of a no-start issue as the CPS will test good when in fact it is bad.
The problem with the ohms test is you can have the correct amount of resistance through the CPS but it isn’t generating enough voltage to trigger the ECU to provide spark.
Unplug the harness connector from the CPS. Using your voltmeter set on AC volts and probing both wires in the connector going to the CPS, crank the engine over. It won’t start with the CPS disconnected.
You should get a reading of .5 AC volts.
If you are down in the .35 AC volts range or lower on your meter reading, you can have intermittent crank/no-start conditions from your Renix Jeep. Some NEW CPSs (from the big box parts stores) have registered only .2 AC volts while reading the proper resistance!! That’s a definite no-start condition. Best to buy your CPS from Napa or the dealer.
Sometimes on a manual transmission equipped Renix Jeep there is an accumulation of debris on the tip of the CPS. It’s worn off clutch material and since the CPS is a magnet, the metal sticks to the tip of the CPS causing a reduced voltage signal. You MAY get by with cleaning the tip of the CPS off.
A little trick for increasing the output of your CPS is to drill out the upper mounting hole to 3/8" from the stock 5/16", or slot it so the CPS bracket rests on the bell housing when pushed down. Then, when mounting it, hold the CPS down as close to the flywheel as you can while tightening the bolts.
[/B][/SIZE][/FONT][/SIZE][/FONT]
　
　
Revised 01-26-2013
Click to expand...

Test CPS as suggested.
 
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