97 tsi 4.0 no start - JeepForum.com

 
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post #1 of 4 Old 02-11-2014, 09:26 PM Thread Starter
93zjbums
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1993 ZJ 
 
Join Date: Feb 2011
Location: kalamazoo
Posts: 288
97 tsi 4.0 no start

im getting a 97 zj tsi 4.0 from my uncle and one day it wouldnt start. now its been sitting 2 years. he bypassed security it has fuel pressure but no spark. he said the coil is only getting 1.3 volts???? the crank sensor he said he ohm out and thought it was good. any thoughts or ideas im going to start trying to get it running sunday.


93 zj laredo 4.0 with k & n intake 2 inch bb skyjacker shocks and 31 bfg at
92 chevy cheyenne 4x4 w/t with 32in procomps "The Beast" 184k
92 honda accord ex
92 xj stock 358k miles wifes
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post #2 of 4 Old 02-11-2014, 11:48 PM
Oldfrog
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2007 WK 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 5,092
1. Check fuse # 20 ( I think) under the hood. If blown, check the lower o2 sensor wiring. It shorts out often. Very common. This would cause a no spark condition.
2. Go here to properly test the crank sensor.
https://www.youtube.com/watch?v=yp_kK6U8a64 If it's bad, replace ONLY with a Mopar sensor. Do not use an aftermarket crank sensor.
3. Pull the tps connector, turn the ignition key on, and test the voltage across the outside two pins. It should read 5 volts DC. If not, begin unplugging the crank sensor connector, and then checking the tps connector for 5 v again, then do the same thing with the cam sensor ( inside the distributor) and temp sensor. If the 5 volts returns to the tps, then you have found your problem.
4. When the key is turned on, the fuel pump primes for 2-3 seconds. Then when key is turned to the start position, the PCM gathers data from several sources. If it does NOT get a good crank sensor reading inside of 3 seconds, it activates the ASD relay and shuts down the fuel pump, coil drivers, etc.

Bad grounding points are a major issue on this model. Remove, clean and tighten the 3 major grounds. One below the coil, one near the oil dipstick and one at the passenger side fender well. A low battery ( below 13.4 volts) will also mess with the pcm. Make sure it has more then 13 volts before trying to start the engine.

Do this much and if no luck, go through zeejays dirty dozen list.

Does the CEL light up when they key is turned to the on position? If not, your PCM is probably bad.
Oh....one more thing....if the horn works, swap the horn relay with the asd relay ( they are both under the hood in the PDC).

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #3 of 4 Old 02-12-2014, 05:24 AM
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Posts: 8,635
Quote:
Originally Posted by 93zjbums View Post
he said the coil is only getting 1.3 volts????
take note that the coil is only powered up when cranking or running. So if he turned the switch on and checked the voltage, that may be why it's reading 1.3 volts.

cam sensor will also keep it from cranking, but this is not as common as crank sensor failure.
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post #4 of 4 Old 02-16-2014, 12:52 AM Thread Starter
93zjbums
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1993 ZJ 
 
Join Date: Feb 2011
Location: kalamazoo
Posts: 288
Thanks for all the help I'm checking it out tomorrow

93 zj laredo 4.0 with k & n intake 2 inch bb skyjacker shocks and 31 bfg at
92 chevy cheyenne 4x4 w/t with 32in procomps "The Beast" 184k
92 honda accord ex
92 xj stock 358k miles wifes
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