Cylinder Misfire code when floored

[2001 RED XJ]

Re: TRANSMISSION PROBLEM

Aftermarket but it didn't help. I recently had a motor put in. Not sure if its transmission or engine related. It like the motor falls flat on its face at 65. It's like something is preventing it to shift to the next gear. The transmission isn't doing anything because its not time to shift yet.

 

[2001 RED XJ]

Re: TRANSMISSION PROBLEM

Could this be camshaft timing being off. This is a High Performance Motor with a bigger cam ported heads. This motor screams until it hits 65.

 

[2001 RED XJ]

Re: Camshaft timing

Yes I have two accounts I couldn't remember my info for the 1993 account. What is a dizzy? Are you talking about the cam position sensor? I am not a mechanic. I didn't put the motor in.

 

[DieselSJ]

Re: Camshaft timing

Yes I have two accounts I couldn't remember my info for the 1993 account. What is a dizzy? Are you talking about the cam position sensor? I am not a mechanic. I didn't put the motor in.

Sorry, dizzy is distributor. In the distributor hole on your block should be a cam sensor.

 

[2001 RED XJ]

Re: Camshaft timing

How do you tell if its installed correctly?

 

[Sidewinder CC]

Re: Camshaft timing

How do you tell if its installed correctly?

Look through this tread.


http://www.naxja.org/forum/showthread.php?t=1122502&page=2

 

[sidewaysstarion]

Re: Camshaft timing

Sounds like a possible fuel delivery issue.

 

[sidewaysstarion]

Having a weak fuel pump could cause the pressure to drop when you floor it leading to your misfire. Check your fuel pressure under load.

 

[sidewaysstarion]

Re: TRANSMISSION PROBLEM

Could this be camshaft timing being off. This is a High Performance Motor with a bigger cam ported heads. This motor screams until it hits 65.

Cam timing wouldn't prevent the trans from kicking out of OD when you floor it.

 

[Digger87xj]

Re: TRANSMISSION PROBLEM

fuel starvation?

 

[1993 Red XJ]

Re: TRANSMISSION PROBLEM

Well when I floor it at 70 I have had it up to 95. I wouldn't think it would run that fast if it had fuel starvation.

 

[1993 Red XJ]

Re: TRANSMISSION PROBLEM

The trans won't go into 3rd it kicks out of Overdrive and shifts to second when I floor it. Won't go past 4500 RPM

 

[2001 RED XJ]

Re: Camshaft timing

I can floor my jeep at 70 and I can get up to 95 and then I let off. I don't think its a fuel problem.

 

[DieselSJ]

Re: Camshaft timing

I can floor my jeep at 70 and I can get up to 95 and then I let off. I don't think its a fuel problem.

I don't think that is a cam timing issue.

What does it do if you shift it manually? Put it into 1/2 and floor it. Let it shift through first into second. When you get over 4k, then push the shifter into 3rd.

Do this and tell us what happens.

 

[2001 RED XJ]

Re: Camshaft timing

I haven't tried shifting manually but I will tomorrow.

 

[2001 RED XJ]

I think the misfire is because it won't go past 65. It's like its hitting a brick wall.

 

[Digger87xj]

Re: TRANSMISSION PROBLEM

Well when I floor it at 70 I have had it up to 95. I wouldn't think it would run that fast if it had fuel starvation.

The trans won't go into 3rd it kicks out of Overdrive and shifts to second when I floor it. Won't go past 4500 RPM

70 to 95 does not require the fuel volume that the second gear @4500 rpm requires to gain the MAP required for an upshift.

While working at the GMC dealer back in the day I cured many a "my truck won't shift, the transmission is bad" complaints with a fuel filter. They would subsequently need a fuel pump replacement a few weeks later as well, as the strain the pump was under ruined it.
They had the very same symptoms... hold the pedal down, and the engine just hung there, revving but not gaining speed, until you let up and let it shift up, then it was fine, or seemed fine from there up to whatever speed until you needed to downshift for a hill or whatever, and it would do it all over again.

Won't hurt to put a gauge on it or do a volume test.

 

[2001 RED XJ]

Re: TRANSMISSION PROBLEM

Rail has 45 PSI what should it be when engine is off, while running, and under load.

 

[Talyn]

Re: Camshaft timing

Is this on a 1993 or 2000?

 

[2001 RED XJ]

Re: Camshaft timing

2001