Hesitation @ 2-2.5k

[WolfpackTLC]

I changed my plugs yesterday in my 80. It's pushing 194k, and I'm browning out the tips of the plugs... of course, the rear knock sensor is not sending a signal, so I think I'm in limp mode... gas mileage hasn't changed, so I'm kinda confused there...

Anyways.... I didn't have this hesitation prior to changing the plugs. I pulled the EFI fuse to reset the system, and I simply removed and replaced the plugs. While doing the plugs, I also changed the oil and filter, and ran a couple of cans of Seafoam through the motor, with great results.

The problem now is that under light throttle I get a hesistation around 2k-2.5k.... not really pinging or detonation that I can hear... I haven't pulled the plugs to look at them yet, but I can't fathom what could have changed to cause such a problem. All my vaccum lines check out that I can notice, and all the plug wires are seated and such... any ideas?

 

[landtoy80]

SeaFoam good stuff. In the oil, gas or in the PCV?
What year 80? Add it to you sig line.
What plugs?
Have you ran a tank of BG44K or Toyota FI cleaner?

If 94. Check the air hose from the air cleaner to the intake (big black hose). Look where the hose has ribs, see if it has any cracks in it.

 

[WolfpackTLC]

95 TLC, TRD S/C, NGK plugs (factory recommendation.... wait... maybe I should have gotten colder ones...hmm)

Seafoam went into all three....

 

[Doc]

The Seafoam may have knocked a chunk of carbon loose and perhaps it's lodged in an area that constricts airflow in the rpm band indicated?

 

[WolfpackTLC]

Hmmm... interesting theory, although I'm not educated enough to know if that's possible. Physics would dictate that an obstruction is an obstruction, regardless of rate of flow, so I don't think that's it...

 

[cruiserdan]

The airflow meter may be hanging up. Also check the air intake hoses at the throttlebody inlet and blower manifold outlet.

 

[WolfpackTLC]

Oh, and while I'm sure this is unrelated, I charged my AC, and now it doesn't blow cold... at all...and when you turn the AC on, it bogs the motor down...

J

 

[cruiserdan]

Sounds like it's over-charged

 

[WolfpackTLC]

That's probably it... stupid cheap ass gauges... What do I do to release the R-134 and still remain within EPA guidelines?

 

[cruiserdan]

You could run into something and poke a hole in the condensor.......

 

[dd113]

Did ya gap the plugs correctly?

 

[WolfpackTLC]

Mmm.hmm... .80 or is it .080.... whatever...

Improperly gapped plugs would have an effect on the motor throughout it's operating range, not just @ the specified problem area...