If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
|
#1
|
|||
|
|||
1990 Jeep Cherokee LTD no start/no spark
Hey guys,
I've got a very frustrating problem here. Customer brought in a 1990 Jeep cherokee limited, 4whldrv, automatic. We replaced the engine with one from a 1996. All the appropriate electronics were switched from the old engine to the new including, distributor, cap, rotor, coil, CPS, flywheel, intake and exhaust, all injectors (already on old intake). The problem is we now have a no start/no spark condition. This swamp is common at our shop, (newer 4.0L into older jeep) and always goes off without a hitch. This is the first time I've run into this. We've replaced the CPS, coil and ignition module check out O.K., Distributor checks out. We even put all the suspect parts into another jeep and they worked fine. The computer has also been replaced but to no avail. Any input would be appreciated. Thanks. Jesse |
#2
|
|||
|
|||
1990 Jeep Cherokee LTD no start/no spark
asd relay or efi main? If you scan it do you see cranking rpms.
> wrote in message ups.com... > Hey guys, > > I've got a very frustrating problem here. Customer brought in a 1990 > Jeep cherokee limited, 4whldrv, automatic. We replaced the engine with > one from a 1996. All the appropriate electronics were switched from > the old engine to the new including, distributor, cap, rotor, coil, > CPS, flywheel, intake and exhaust, all injectors (already on old > intake). The problem is we now have a no start/no spark condition. > This swamp is common at our shop, (newer 4.0L into older jeep) and > always goes off without a hitch. This is the first time I've run into > this. We've replaced the CPS, coil and ignition module check out O.K., > Distributor checks out. We even put all the suspect parts into another > jeep and they worked fine. The computer has also been replaced but to > no avail. Any input would be appreciated. Thanks. > Jesse > ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#3
|
|||
|
|||
1990 Jeep Cherokee LTD no start/no spark
1990 Cherokee. No ASD relay.
|
#4
|
|||
|
|||
1990 Jeep Cherokee LTD no start/no spark
The 90 had a Renix computer system, the 96 has a Chrysler one. You need
the computer and harness from the 96 to get things going. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Shep wrote: > > asd relay or efi main? If you scan it do you see cranking rpms. > > wrote in message > ups.com... > > Hey guys, > > > > I've got a very frustrating problem here. Customer brought in a 1990 > > Jeep cherokee limited, 4whldrv, automatic. We replaced the engine with > > one from a 1996. All the appropriate electronics were switched from > > the old engine to the new including, distributor, cap, rotor, coil, > > CPS, flywheel, intake and exhaust, all injectors (already on old > > intake). The problem is we now have a no start/no spark condition. > > This swamp is common at our shop, (newer 4.0L into older jeep) and > > always goes off without a hitch. This is the first time I've run into > > this. We've replaced the CPS, coil and ignition module check out O.K., > > Distributor checks out. We even put all the suspect parts into another > > jeep and they worked fine. The computer has also been replaced but to > > no avail. Any input would be appreciated. Thanks. > > Jesse > > > > ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- > http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups > ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#5
|
|||
|
|||
1990 Jeep Cherokee LTD no start/no spark
No we don't. We used ALL of the electronics from the Bendix system.
There are absolutely NO 1996 electronics on this engine now. This is a swap we've done multiple times and never had this problem. As long as all the electronics are swapped over from the old engine it works fine. This problem is not because of incorrect electronics. |
#6
|
|||
|
|||
1990 Jeep Cherokee LTD no start/no spark
Read that wrong....
How is the wire mesh ground strap from the rear of the head to the firewall? If that is ratty, it will cause a no spark. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) spydey wrote: > > No we don't. We used ALL of the electronics from the Bendix system. > There are absolutely NO 1996 electronics on this engine now. This is a > swap we've done multiple times and never had this problem. As long as > all the electronics are swapped over from the old engine it works fine. > This problem is not because of incorrect electronics. |
#7
|
|||
|
|||
1990 Jeep Cherokee LTD no start/no spark
It's brand new and the connection is good
|
#8
|
|||
|
|||
1990 Jeep Cherokee LTD no start/no spark
Just a thought>>>>>>>>> Since you dropped in a newer engine, is it possible you clipped a harness wire, that is is shorting itself out at the firewall? I had a new engine dropped into my Cherokee, it gave the same symptoms you describe, and we finally found a frayed harness wire that kept shorting out against the metal. -- Knifeblade_03 ------------------------------------------------------------------------ Knifeblade_03's Profile: http://www.automotiveforums.com/vbul...?userid=262826 View this thread: http://www.automotiveforums.com/vbul...d.php?t=559753 http://www.automotiveforums.com |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Jeep news from Chrysler | Scott in Baltimore | Jeep | 20 | June 28th 06 01:15 AM |
1995 Jeep Grand Cherokee Won't Start | jdurrmsu | Chrysler | 5 | August 12th 05 08:42 PM |
sluggish start on my 91 Jeep Cherokee Laredo | ksoyk | 4x4 | 4 | July 17th 05 01:46 AM |
Jeep Grand Cherokee 5.7 Hemi in UK | Dori A Schmetterling | Chrysler | 4 | June 2nd 05 10:22 PM |
1994 Jeep Cherokee 4WD Automatic Transmission questions | brookman1973 | Jeep | 11 | February 13th 05 06:42 PM |