Ok, got an 89 with the 2.4l and its a 5 speed. The issue I'm having is that if I don't run the piss out of it and keep it at or above 3500 rpm, I have no power. I can hammer on it all day under 3500 and it just bogs like the choke is on, but once it hits 3500 its like having nitrous. The idle is horrible too, it'll drop to 400 and sometimes stall. I think I even heard it try to backfire through the intake.

So, I'm thinking its my MAF. How can I check this? Am I on the right path?

Please help!!! Lol. My only other ride is a crotch rocket and I haven't got it legal yet.

THANKS!!!!!

 

you might wanna check the MAF door to make sure it moves freely, also check for vacuum leaks or any intake leaks after the MAF.

 

Check that an then Ohm out your tps

 

im going to say the cam is off a tooth. when my engine got rebuilt the idiot (not me) that rebuilt it had the cam off 1 tooth and it was a dog until about 3k and then it took off.

 

I'll check the door and leaks tomorrow. Thanks!

Is it possible for the cam to jump like that though? What's the easiest way to check? Timing light?

I'll check the tps tomorrow too if I get a chance.

Thanks guys, hopefully this'll get cleared up soon.

 

The intake pipe between the VAFM and the throttle body, ensure there are no leaks.
Check your ignition timing after you verified the cam is not off by a tooth.
Check your spark plug wires to make sure they are good and fully connected.

 

Sounds like timing but hows your idle?High,low,rough,also your dist setting where's it at?

 

Ok, I know the cam didn't jump cuz it's an intermediate problem.

I sat with my foot on the throttle at an even idle and it straightened out and ran fine after sitting there for about 5mins.

I'm really leaning to a vacuum of some sort, but idk yet. Tried spraying carb cleaner around the vacuum hoses and couldn't get a response from the engine, so I'm gonna try it again after I fill it with gas and try running some injector cleaner to see if maybe it's my injectors.

 

That's what I'm thinking tps out of wack or a delayed and faulty/dirty mas air meter

 

Ok, I'll check that stuff later.

I don't know if this helps, but when I start it cold it idles up to 2000 and runs great until the engine starts to warm up (roughly 2mins).

 

Have u checked the ecu opening circuit relay for pitting I believe it's located on the right side kick panel I've heard of these rusting and pitting on the contacts creating low insufficient voltage .. Just a suggestion how's the condition of the fuel filter cap rotors plugs as this is proably not it but a from what u describe 2000rpms when it's cold is that kinda high for 22re ..that may be tps sensor bad I would search every vacuum tube and air inlet tubes for cracks . U didn't spray carb cleaner n the Mas air meter did you at any point in the trucks life ?

 

Lol, no carb cleaner through intake.

I was sitting here on my lunch and instead of holding the throttle to keep the engine running, I let off completely and the idle would just go up and down between 300-800rpm or so. It was just up, down, up, down, etc. Oh, and the idle is very rough.

I'm going to get some contact cleaner tonight and spray the maf to see if that helps.

Thanks a lot guys, I appreciate all the suggestions!!

 

If I unplug the tps while the truck is running, shouldnt it make a difference somehow? I unplugged it earlier and the idle didn't change and it revved like normal (Truck went back to running like nothing was ever wrong. I don't know why!!!!).

 

adjust tps then.

 

Ok, let me start over a bit.

Truck will start fine cold, but the second it starts to warm up, the idle gets real rough and low, then when you try driving, the acceleration up to 3500 is slow and almost non existent but opens up completely AFTER 3500RPM.

Now, sometimes the truck will "sort itself out" and run like nothing ever happened. This happened for a bit yesterday, so I unplugged the tps to see if anything would happen, but nothing did. I could rev it and nothing changed. I haven't unplugged it during one of its fits or tried driving with it unplugged yet.

Vacuums all seem good and no leaks anywhere that we can find. The MAF when unplugged kills the engine right away, so I think it's working right.

I'm kinda stumped at this point cuz it does every once in a while run normal, so there's gotta be some valve sticking somewhere.

 

Sounds like our timing.. Check it

 

If possible borrow the maf off a friends truck and try it on yours.We had the same symptoms on my friends truck and we were fkin with everything from tps to jumping the fuel pump I went home and grabbed my spare maf and slapped it on and no more problems.The reving up and down is a give away for a maf problem

 

I'm not ruling out the maf, but timing I believe is fine.

Been driving with no tps plugged in and it runs great!!! Bad tps then?

 

Funny thing at the time we were fkin with my friends truck we unplugged the tps on my 92 to check something(wire colors or something i can't remember) and I drove it the next day to work and came back home to continue working on my friends truck we went back to check my tps again and we had forgotten to plug it back in the day before and it ran just fine for me so I'm kinda stumped on this one.

 

adjust the tps.