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Discussion Starter #1
So getting really frustrated with this, I don't know what to try next. Got a ride planned in two weeks.

It hasn't been starting with just a key turn. I have to give it a little throttle to start. Must maintain slight throttle pressure to idle or it will die. After a few minutes of warm up it will idle on it's own. The other thing it will often die after you let of the throttle after mid to high rpm instead of returning to idle.

I replaced the plugs with new ones, replaced the spark plug wires too. The front plug was black/tan the rear plug was black. No active codes and the TPS is set in the middle.


I'm considering draining the gas, adjusting the valves, throttle cable adjustment and trading it in. :D
 

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Discussion Starter #3
I might pick up tester and see. Doesn't explain the black plugs, so I think I got more stuff going on.
My fuel guage is way off, on two bars on the gauge, I'm bone dry. Maybe it's time for a new one.


Update: So I turned up the idle and it will start and stay running on just key. I'll test drive tomorrow.
 

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Discussion Starter #4
So it will start on a key turn and idle. At 1500rpms no solid information on what it is suppose to do. I don't see it in the service manual and the internet is full of conflicting info.

I feel like I covered the problem instead of fixing it. Shouldn't the EFI maintain a high idle for until warm? Thus do I have sensors not providing info or incorrect information to the ECU? Still smells a little rich too.
 

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It should go back down to normal idle around 1300. Does the fuel pump hold a constant 43psi? Or make a grinding noise?
Pull the fuel pump assembly just enough you can hear in the tank and turn it on.


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Hey Firecat. I had a similar problem with my 700 a while back. The steps I took included clearing the vent line for the fuel tank by disconnecting and blowing air through it with the compressor and a new plug. I also drained my gas to make sure there was no water. After that, it worked and was back to normal.
 

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Idle speed is 1,300-1,350 (at least on the 700's!)
 

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Discussion Starter #8
doesn't run very smooth at that rpm now. Happier at 1500 and up. That's a problem because I set the idle rpms when it was cold and after a warm up run It was idling at 1800, which is bad. grind the gears bad.

I lowered the idle down to 1400 when warm. Going to let it cool off and try to start it.

I'm wondering about the ISC..... Anyone now how to test one? I didn't see that in the service manual.
 

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Once you have the throttle cable adjusted and the TPS set, then set the ISC. That tells the computer the throttle range. I did it once on our XTX and it fixed a similar problem like you are having.


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Discussion Starter #11 (Edited)
Thanks AF. I had to reset the TPS again, every time I tighten the screw it moves the signal bar up. :( and then the ISC. It's working, the ISC, I hear it making noise so it's moving. I'll be able to take a short test run later today and see. The good news is it started cold and idled around 1350-1400 rpms. So I think I'm making progress.

The fuel pumps seems to be working fine. FYI for anyone working on a cat fuel line. I broke a couple of the retaining clips for the fuel line. My local O'rielly's had dorman clip retainers that worked, you need both sizes on a H2. $4.50 for 6 clips, cat doesn't sell the clips or the retainers.
 

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I used the "white" Ford clips on my 700. Glad you ate making progress!
 

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Discussion Starter #13
Well it ran well for 120 miles of some difficult riding. Wisconsin received 5 plus inches of rain the day before so the holes were all filled to the brim on the Dead Horse system. So that slows you down, we averaged 12.7 mph. Yup almost 10 hours of drive time and almost two tanks of gas riding Friday night and all day Saturday. Got the belt a little wet once and it slipped but that was the only issue for the Prowler.

Going to check the plugs and see if the back one is black again or a nice brown.


Thanks for you help.
 
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