weird prob with my Tacoma

[jstarnes]

Im having a Prob with my Toco it runs and drives ok but some times when I first let the clutch out in first and just after I let the clutch out after shifting to second the enging shakes and misses and a few times it has back fired

at first I was thinking my Pressure plate was not relocking up as fast as it should and I was getting a shudder untill it locked up? I dont think this is the case now that I have herd it back fire

I also thought it had a tank of bad gas but it does it all the time now??

the truck is a 02 and it has 70K miles and its a 2.2 (If I remember correctly)

what kind of things need to be done at or near 70K that might cause this?

any thoughts as to what it could be

it runs great above 1500rpm but between 1000 and 1500 it does this and it seems to only be in first or second



THANKS for any help you can offer!!!

[Tool Guy]

if it shakes and misses during accelaration, try a full tune up (plugs, wires, cap, etc..).  may as well change the gas filter also.

[Red_Runner]

if its an 02 it mite have the warranty take it to toyota. keep us posted to what it is. you can never know to much

[BigMike]

Hey jstarnes -

I'll put money that its your air flow meter.

I just got my 2.7 running and it would not idle at all. And Marlin put together a 3.4 V6 and it had bad power below about 2000 and then ran great once it got moving.

Here's the problem in both situations (you can read more about it on my post here):




I cleaned it by using some Brake cleaner, but carb cleaner should work as well. Just make shure the cleanrer is non-chlorinated. I removed the two screw on top of the sensor and carefully pulled the sensor out. Then I just completely soaked the wires with the cleaner. Then, I gently used some compressed air at a distance to help evaporate the cleaner. And that was it. I also cleaned out the aluminum housing that the sensor goes into.

This solved the problem immediately. I was a night and day difference for me and I highly recommend this.

A tech from Toyota told Marlin that sometimes when people install an aftermarket cone airfilter - oil type like a K&N - that the oils from the new filter will stick to the sensor wire and it will screw everything up.

Anyways, pull it apart and see if it is as bad looking as mine was, and then clean it!!

Let us know,
BigMike

[jstarnes]

well I cleaned the widget in the air flow meter

it was not dirty at all like the one in the pic but I cleaned it any way and it now does the stttttuuuuddddeeeeerrrr at higher speeds??

it seems as if I might have a bad air meter any thoughts??

[BigMike]

[Crawler677]

injecter pulse?

sounds to me like a sensor is being funny and tellin the EFI to do weird things 

[MudSlinginYota]

warrentys work great. i abuse the crap out of mine

[TacoStewie]

I am having the same problem with my 96 3.4.  i have replaced the fuel filter and it still does it so this weekend i will be replacing the injectors.

[Destruct O]

If your engine is back firing the computer must know whats going on, just for kicks hook up a code scanner to it. 

[Bork]

It moost be-a bed eur floo meter leeke-a BeegMike-a seys

Bork

[TacoStewie]

The other week my check engine light finally came on and said i ha a "miss fire in cylinder #4"  6 new spark plugs and the thing runs like new.

[8D3TOY]

I agree with Bork no matter what he says.

[krawlr]

I'd check your service intervals in the owners manual. My '98 calls for plugs at 30k. If you ran plugs good for 30k all the way up to 70k then I would go for wires. In fact I go for wires at 60k anyways. Should be distributor-less with coil packs so no cap and rotor to worry about. Also check the coil resistance across the towers, they can still fire when they go open and put a strain on the ECU outputs.

Secondary coil resistance:
Cold: 9.7 - 16.7 k ohms
Hot: 12.4 - 19.6 k ohms

[MidgetMike]

Another miss fire cause in the 2.7's are burnt valves #3 they will tighten up over time so it is a good idea to check their clearance. I checked mine on my taco the first week I had it and 3 and 4 were tight