oneal916

so i just got my jeep put back together and notice that when i stuff the gas to the floor it will not get up and go . i did everything by the book and what it said to do.

what would cause it to not go over 3000 Rpms and not shift properly

ezab

Why was it taken apart?

tjwalker

Exactly. You must provide us with details.

If something worked before you took it apart, cause and effect principle is in play here....

Gotta look at all work performed.

oneal916

it was taking apart to get the cylinder head resurface and have an exhaust stud fixed. the exhaust stud wasn't the problem after the fact i drove it around. put this 3000 rpm problem happen before this

tjwalker

If this problem was happening before the work performed, I'd start with this:

1. Test your "throttle position sensor" It is directly involved with transmission shifting characteristics and throttle tip in. Also, the TPS on your 1990 IS adjustable and adjustment is very important. All of this needs to be done with a meter and a manual with the exact procedure.

Here is a link though to a good article on testing all things RENIX. Bookmark it. It is invaluable.

http://www.lunghd.com/Tech_Articles/...iagnostics.htm

2. If TPS checks out, verify actual fuel pressure with a fuel pressure gauge installed on the schrader valve on the fuel rail.

But because you describe a problem with shifting as well, the TPS is really a primary suspect here.

ezab

To start I would test your TPS and adjust your TV Cable.

tjwalker

Good catch ezab, the TV cable is also in play here. Here is a link to how to do that.........

http://naxja.org/forum/showthread.php?t=1015963

lilredxj99

Does it run bad? Spit, sputter, prolonged start? Does it rev up better when in neutral? Details man, details.

oneal916

yes it does rev up better in neutral . it just acts up in drive

oneal916

see this seems more of whats happening . but i shift from 1 to 2 and it wont go above 3000 rpms granted i have gotten that gear to go over in the past . after it hits close to the 3000 rpms it wont go any faster but it will go up in rpms until i put in 3rd gear. and then it gets slugguse and then i go to OD and wont go over 3000rpms . ive did the little trick today of the cable and it didnt seem like it did anything maybe i adjusted it wrong

tjwalker

The next thing you must do is test your throttle position sensor. And adjust it.

The factory service manual flowchart also recommends this before moving onto more complex possibilities.

Don't look elsewhere until the TPS circuit is completely verified.

oneal916

ok so i did look at the tps sensor and i think it is bad . the only thing was one, the little arm behind the sensor wasnt on the right way. i fixed that but still getting the same thing . i did test the eletrical but i dont think im doing it right and i followed the link and how it told me to test the tps sensor just like what the book said.

lilredxj99

You probably need to check the fuel pressure. Low fuel pressure can cause the same problems.

tjwalker

If you are unsure in any way that your testing of the TPS isn't accurate, then the TPS is absolutely still in play here!

oneal916

i looked at that also how do you go about testing the fuel pressure ? is there a certain tool for it