wire problems

**TeraFlexTJ** · 07-28-2008, 07:10 AM

I put a LS1 in a jeep. It runs great. Just will not go over 2000 rpms. I have got a new computer thinking that was the problem and it is still doing it. I have a turbo 350 trans. They programed the computer for a manual trans. thinking that was the problem.
They are telling me that they have never heard of this problem.

HELP

**Orcus79** · 07-28-2008, 08:12 AM

almost sounds like it is stuck in what is called "limp mode" gives you just enough to keep from blowing up and to get off the road safely.

Any way you can get scanner on it and see what is going on?

Best suggestion is to double check all the connections of all the sensors, fuel feed adn so forth? Are you running any O2 sensors?

**Spaz** · 07-28-2008, 10:01 AM

Originally Posted by Orcus79

almost sounds like it is stuck in what is called "limp mode" gives you just enough to keep from blowing up and to get off the road safely.

Any way you can get scanner on it and see what is going on?

Best suggestion is to double check all the connections of all the sensors, fuel feed adn so forth? Are you running any O2 sensors?

you need to scan for codes and see what is being thrown...

**TeraFlexTJ** · 07-28-2008, 11:21 AM

I have O2 sensors. My check engine light is not lighting up. Would it be still throwing a code if the light is not on?

**Spaz** · 07-28-2008, 12:28 PM

Originally Posted by TeraFlexTJ

I have O2 sensors. My check engine light is not lighting up. Would it be still throwing a code if the light is not on?

very possible... that was my problem when my cats took a shit on me... i took it for a code scan and boom... no ses light but it was throwing codes...

**0rion** · 07-28-2008, 04:48 PM

I would start simple at first....probe the tps sensor with a volt meter with the key on engine off and see what voltage you're seeing at wot. Should be ~5 volts or a little less. Since it's a transplant it could be a number of things. Just have to start chasing stuff down. Are you running the MAF on it? Are you 100% that the ses light is functioning? Does it light up when you turn the key to run?

**TeraFlexTJ** · 07-30-2008, 04:57 PM

could it be the fuel pump?

**Hot Black Trans-Am** · 07-30-2008, 05:06 PM

may be dumb idea, but is the throttle cable the right length?

**TeraFlexTJ** · 07-31-2008, 05:54 AM

the cable is the right length. Could it be the motor is getting to much air?

**sunsetorangess** · 07-31-2008, 06:01 AM

Are you running maf or speed density?
From under the hood if you manualy push the butterfly back, it still wont go past 2000 rpm?
J

**TeraFlexTJ** · 07-31-2008, 11:13 AM

I can manualy push the butterfly back and it still will not go over 2000 rpm.

**0rion** · 07-31-2008, 11:18 AM

are you running the maf?

**FORD RECOVERY EXPERT** · 07-31-2008, 12:21 PM

TJ, Answer ALL questions please.

**570SX** · 08-07-2008, 02:47 PM

+1 for MAF question. back when i was running a Nissan motor the ECU would cut at 2500rpm if the MAF was either disconnected or otherwise defunct. lots of people would ask why they couldn't rev their new engine, and i've never heard of any other problem giving that symptom.

if it is connected, probe its wires at its connector and at the ECU to see if there's a break somewhere.