Hard to start

[Ozark mike]

I undone positive battery cable to change upper alternator bracket. Got it changed hooked battery back up. Now it is hard to start and check engine light is on. Fixing to check code. It seems like it doesn’t have fuel pressure. I can turn it over and pat the gas it will finally crank and runs fine. Before ide just hit the key and it would crank right up.

 

[Ozark mike]

Wow. I pulled codes was saying tps sensor. I had replace all of the sensors when I replace the engine. I pull tps and out old one in cranks fine now. That makes no sense to me. But it’s fixed.

 

[Gilaguy23]

Odd, however when you disco'ed the battery the ECM may have dumped its "adaptive memory" and needs to relearn. Regardless it should have started normally.

 

[deadpool1]

1894 4.0L jeep YJ, 130 year old jeep running.
the TPS must be indexed at the install, the FSM shows how and a photo of how in the FSM manual free
if not indexed correctly it will fail.
it can not just be thrown on.
sorry but those are the facts.
the book is free. to read
PDF icon #3 here

STICKY - Jeep Wrangler YJ Factory Service Manuals (FSM) and Part Catalogs

I thought that this might be helpful to fellow YJ owners to make one sticky resource thread with all of the original factory service manuals and parts catalogs for 1987-1995 Jeep Wrangler YJs. If you have anything I'm missing, please feel free to post them in this thread and I'll add them to...

wrangleryjforum.com

free and can be, read the TPS page, dont guess just do what it tells.
yes PCM reset the TPS is auto learned. (battery disconnected) and put back
the whole PCM auto learns it all. no Scan tools needed, but one step in FSM for injector sync.

 

[deadpool1]

FSM page 1, EFI
says pull the battery neg lug to service any EFI parts. or risk blowing up a good PCM and $500 damage or more.