BenM

Been dealing with this for about a week now, can't seem to figure it out. Truck is an '86 4x4 5-speed SR5 w/ 220K miles. The timing chain, oil pump and water pump were all done @ 218K miles.

The truck idles very well most of the time at around 750-800rpm (sometimes idle dips down to 500rpm) and revs freely when in neutral. Does ok on flat surfaces and down hills, but as soon as it hits a slight incline it loses power and just can't seem to maintain speed. It's much worse in 4th and 5th and especially below 3500rpm.

Was throwing a code 11, but adjusted the TPS and it went away. I just adjusted the timing as well and its pretty much dead on at 5 dBTDC. Grounded each of the spark plugs and they are getting strong spark as well. The AFM, CTS, TPS, O2 and other EFI sensors check out as well. Pretty sure there aren't any vacuum leaks either.

Going to seafoam the motor then replace the fuel filter, cap, rotor & plugs. Just looking for other things to check like possible clogged cat or anything else I'm not thinking of.

Thanks,
Ben

91_TOYOTA_4x4

its a 22re, it doesn't like hills and will never be able to take a hill

BenM

ha! I just want to be able to at least maintain speed and not have it slow down uphill.

Also, I just seamfoamed the engine and let it sit in there for about 20 minutes and after starting it and letting it run it seems to be running much much better. I have to change the exhaust manifold and downpipe gaskets tomorrow so I may run another 1/3 of a can through the vacuum lines again.

toyota4x4907

What size tires do you have?

BenM

31s.

Thanks for the insight Gnarls. I definitely agree they are underpowered stock, its just that it didn't seem so low on power before. Yeah Bear Mountain is the highest point, but its about an hour away from where I am (New Haven). I just use it as a daily beater/random crap hauler so no real hills, just random highway and around town driving. But I was planning on taking it up to Vermont to my buddy's place in Green Mountains.

I guess it was more of a "chugging" issue where even when I was taking a hill at 30mph in 2nd (3000rpm), with my foot to the floor it wouldn't hold speed at all.

I'll finish the tuneup tomorrow with another can of seafoam and see where it stands. Don't need to go fast (got my old bimmers for that ), just some decent pull.

toyota4x4907

I've found, after owning 3 different 22res over the years, that flooring it does nothing, if anything, makes it worse. The sweet spots were about 1/2 to 3/4 throttle.

A.Wilson013

You could look into finding a supra MAF. Do a search. I climb hills on the freeway with ease now.

There is ONE hill that still defeats me though on the way home to Oregon. It slows everyone down, however...

shawns88

what year supra??

A.Wilson013

IIRC it is the 1982 Supra that is plug n play.

Part number is 22250-43110. I know that for sure (just looked at mine)

Cell phone picture, but you can see it there.

yayfortrees

I hate to ask, but what does the compression read? You mentioned a possible plugged cat. Have you checked that?

BenM

Well just got done installing a new Exhaust Manifold, O2 and gaskets. The front pipe was leaking down by the cat, so I rewelded that too. I've never heard the truck so quiet before! Put in a new cap, rotor, and plugs too.

After driving into work this morning it still was lacking a lot of power and was having trouble cold starting. Figured I might as well check the timing after jumping the diagnostic port, and to my suprise it was advanced probably 10dATDC! Pulled it back to 5dBTDC and the idle moved up, set the idle screw @ around 750-800rpm and it revs nice and freely throughout the RPM range.

Thanks for the input guys, finally enjoying my truck again.