Will only run in reverse

88wagoneerXJ

NAXJA Forum User
my 88 has a new issue where it idles at 100rpm sputtering and won't rev at all in any gear P,N,D,3,L2. However put it in reverse and it's perfectly fine.

Is this the ecu? Thanks!
 
I wonder if the NSS could create such a situation.

I assume the Renix systems have some sort of NSS such as the H.O. systems. Is it something which can be taken apart and cleaned like the H.O. ones?
 
Yes it does and has been cleaned and greased. No change. any other ideas? This is a strange one. Swapped the tcu and same issue as well. rather not have to buy another ecu but if I have to i guess I will just to rule it out. Just seems weird how it runs and revs fine only in reverse. There must be something I'm not thinking of.
 
I can't picture how the NSS would make it sputter.

Long shot here - Are the bellhousing-to-engine bolts tight? No visible gap? You sometimes see the bolts backed out if the trans has been previously removed, but the symptoms are usually backwards with it stalling in reverse. I would also wiggle with wiring harness along the fuel rail, especially where it crosses over to the firewall as that can flex and fray internally if the motor mounts are shot.
 
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