1985 22re 4x4 Loping Idle

[Straight 1985]

Hi guys,

I've spent some time searching around for some answers but can't seem to find any real good ones.

I just got my 22re back from the machine shop who rebuilt the block/heads. I've now bolted everything back on and got the engine back in the truck. At first, the distributor was off a tooth and the exhaust got real hot, but it idled and throttled up just fine. After adjusting the distributor it idles better when it idles flat.

The problem is, if you try and throttle up the engine, it simply doesn't respond and instead the idle lopes between 1400-1800 rpms. Pushing the throttle down against the diaphragm (to close the throttle?) will cause the loping to stop. That was where we stopped for the night.

I have the throttle position sensor to check, the air bypass valve to check, and (probably) a vacuum hose or two incorrectly attached.

Is there something else I should check? Also, does anyone have or can take a photograph of the vacuum lines on an '85 22re in a 4wd. I have a second vacuum switch valve I think the 2wd models did not come with and is not represented/poorly represented in the vacuum diagrams/documentation. I *think* it attaches between the pressure regulator on the fuel rail and goes to somewhere on the air chamber. And I am 99% sure I don't have that hooked up correctly.

Thanks
-Ben

 

[CrowleyFJ40]

Roger Brown has some great pics on his website, here is a link to one specific to the VSV you are asking about.

That VSV can be bypassed, as you will see on the other pictures on Rogers website. Mine is bypassed, no hot start issues. It connects the fuel pressure regulator to the intake at the little 3 port vacuum fitting toward the back of the intake.

 

[pappy]

Sounds like TPS. I recently had the same issue, truck would idle, but I could not maintain rpm. Mine was caused after I washed the engine. Blasting the TPS connectors out with compressed air cured the problem.