Troubleshoot Howell EFI conversion

[rocco53]

I've gotten a lot of good info from this forum and hope someone can help me out. I have a 1981 CJ5 that I got when my uncle past away. He liked to rock climb in colorado, I plan to use it hunting/etc in Arizona. It has a AMC 258 i6 / 4.2l inline six which my nephew and I recently converted using a Howell efi kit. We have also installed a Summit HEI distributor and Hayden electric fan. It had been running good, but recently we've had some cold weather(i know-cold-arizona) and it has been dying when I pull up to a stop in the morning until the engine warms. Starts as soon as I turn the key, so something is signally it to cut power.

just wondering if anyone has thought on what I should check? Jeep is pretty much stock, except for what we did.

Thanks for the help!

 

[Torxhead]

It might be the idle air control valve, does it appear to have no idle speed? When you do a restart the computer it can reset it to normal. The Rochester 220 t.b.i. has a history of those going bad. Sometimes it just needs to be removed and have the carbon cleaned from it. It is located on the passenger side behind a four prong plug. If you purchase one, follow the instructions to set the pintle prior to installation.

 

[rocco53]

thanks for the reply, however, I don't think the idle air control valve is the issue unless it was bad out of the box. The kit has only been on for 2-3 months and the jeep has been driven little as we've been working on replacing leaking gaskets. As for idle speed, I have not noticed any fluctuation, but I will need to check that again as I have been focused on the stall out situation.

another friend mentioned the temperature control sensor. Any thoughts on that beig the problem?

 

[coldair]

It might be the TPS (throttle position sensor) it might have a dead spot when you let off the throttle.

 

[Old Dog]

I'd call Howell they have very good custermer service.

 

[jeeperz]

here is a link on basic tbi troubleshooting.... hope this helps.

Basic Trouble Shooting - Binder Planet Forums

 

[coldair]

Did you ever find out what was wrong?

 

[rocco53]

To all, thanks for the comments. I have not had time to check any of these sugestions yet. To many Holiday activities to deal with first. Also discovered that the valve cover gasket I replaced still leaks, so I am going to get a better gasket for that. Luckily, it was not the oil pan gasket that was just replaced, since it is more difficult to work on.

I'll provide an update when I get the Howell issue resolved.

Thanks!