gzinga

Hi all,

quick info on my rig. 1988 pickup 22RE 4WD, freshly rebuilt at 200K now it has 207. the motor is stock. I live in santa cruz and the truck runs great, about 18-20 in traffic and may be 22-23 in highway. I got it up to 75-80 miles/hr with no problems.

I took it to tahoe hunting and all was well up to 3500f, above that I started getting some engine stalling at very low RPM, like getting to a stop sign or rolling in first gear really slow.

Any idea? AFM perhaps?

thanks,

Gabe

snobdds

I live in Wyoming and take mine up to our cabin and it's around 10,000 feet. You have to remember that the air is "thinner" up there and the oxygen concentration is less. The only thing I do is increase the idle screw and let it breath in a little better. However that makes my idle increase, and when I drop back down to around 7,000 feet my idle is high. So I set it back down a bit. Other than that, I really don't see a huge difference in performance.

I know what your saying though, I freaked out my girlfriend once when I didn't adjust the idle and the truck just died. I acted like we were stranded, because where I go, you will be lucky to see another human durning a week long stay.

gzinga

yeah where I go hunting can get pretty rough....I am new to the 22RE I didn't know this thing got an idle screw?!? even the FI has it?

A.Wilson013

Yes, even the FI has one.

Here are pictures of both the carb and EFI locations.



Good luck,
Alex

snobdds

Yep, thats the one. Just unscrew it to increase the idle (air Mixture) and you should be fine.

gzinga

SWEET! I will post how everything went after words

abecedarian

You should not have to adjust the idle screw on the RE for high altitude. If you do, I'd suspect something else is affectng your idle such as a vacuum leak, or the IAV beneath the throttle body isn't operating properly and a tune up has been done to compensate for a "low idle"... or the last tune up was done without the engine fully warmed up and the thermostat going through 3-4 open/close cycles.

My 88 22re has made the circle up the 395 from Victorville to Reno and Carson City, across the 80 and down to Sacramento, the 101 down through Salinas, the 5 through Bakersfield and Tejon Pass and such and I've never had to adjust the idle screw.
Okay that sounds like a lot. I've spent a couple of years around San Jose and I'm not counting those highways- 280, 380, 580, 680, etc..
want to ask, just PM me.

ScottyC

iTrader: (1)

Valves could be out of adjustement too. Did you ever re-adjust after the the forst couple thousand miles?

broyota

My 86 22re became the dog to end all when I took it skiing. Sierra at Tahoe is above 5000ft, and when I got there, it had no power whatsoever. I wonder if that is just how these are?

gzinga

I got the truck about 2K miles ago so right after the rebuild. Paperwork of it on hand. I had no problems in santa cruz or valley at all. That's why I was surprised when I got above 4K. Even up to around 3500 where my in laws live the truck was just fine.

I left the truck up there since there is very little point in bringing here for now. I got a new O2 sensor and a new MASS sensor to bring up there. Better save than sorry. If those don't work then I guess it's time to dig in.

if the valves were off then I would probably see the truck running rough overall. I did notice now that I think back that the truck always liked to be on the revs....

what's an IAV?

thanks all!

abecedarian

The truck's ECU will see a few things: increased throttle position, decreased air-flow, a leaner air/fuel mix from lack of O2 at altitude, etc. It should be able to compensate though, unless one of the ECU's parameters are already near their maximum amount of adjustment / compensation. Figuring out which one though, is not something we can easily do here.

gzinga

and the answer is....MAF sensor was bad.....truck worked great all of the way up to 8K

snobdds

That's interesting, the toyota dealer's head tech here say's anything above 10,000 feet I would need to adjust the idle screw to allow for more O2/fuel into the intake at idle and higher rpm's. It's been working great for me for the last 10 years...

gzinga

my MAF did make the truck much better overall, more power and smoother ride. I did notice a small drop in idle when I was at 8K but it is okay...I can live with it next is my cold air intake from LC eng. I didn't install it yet but I will do it and post some pics

snobdds

Dang...now you got me thinking I need to test my MAF...

gzinga

in doubt I would, my truck wasn't running quite right and it would always feel like it was loading up. Plus going up the hill in 3rd or 4th wasn't quite an option. Now it runs good and even in 4th I can climb a small hill at 5K feet.

Mountain Cop

I know- old thread. I figured it would be better to revive this one than to start a whole new one. If this doesn't take off, I'll start one anyway.

I drove over from the west side of the Sierras to the east side yesterday, through Tioga Pass (9943'). The truck didn't stall at all, but it did seem to be hurting for air.

Now, considering that this truck was exposed at short range to a barn fire, and that I have had to replace quite a few wires and hoses due to the heat (see my sig), I am wondering if there is a vacuum leak or blockage somewhere. Anyone have any ideas on where to look first?

Thanks for the help. It isn't really that bad (top speed of about 50 at elevation), but I know the truck can run better. How does one "test" a MAF?

MC (from Mammoth Lakes- where it is simply beautiful today)