22re tuneup mystery

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S

STAGE 2

10 Year 15 Year
Joined
Apr 13, 2009
Threads
33
Messages
149
Bought a new truck in march and it just turned over 200k so I'm in the process of doing the major service. When I first got the truck I had the timing chain done and a new head gasket put in as the original owner didn't think it had ever been replaced (197k on a single chain, kudos toyota). The TPS was also bad so it was replaced back then as well. Since then, the truck has been running fine.

Fast forward to yesterday. I finally had some time so I went to town. Replaced plugs, wires, fuel filter, air filter, O2 sensor, cap and rotor (all toyota oem parts). Buttoned everything up and now while it runs smoother under throttle, the idle is rough and lopey. The rpms are spot on where they should be (750-800) and increasing the idle speed doesn't change the problem. I reset the ecu as well and no change. Went back and triple checked everything and cant find

I've done several searches, but cant find anything that mirrors this as the truck was running fine right before. Any ideas?
 
inkpot said:
Howdy! You maight of pinched or cracked one of the many vacuum lines under the hood. Just a small difference might show up at idle but go away on run up. John
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That was one of my thoughts, but everything I was working on was on the opposite side of the engine away from the vaccum lines. They literally weren't touched.
 
STAGE 2 said:
That was one of my thoughts, but everything I was working on was on the opposite side of the engine away from the vaccum lines. They literally weren't touched.
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Maybe the rotor's slightly out of time on the dizzy, or a MAP, MAF, or TPS sensor's slightly out of whack?
 
Check the rubber intake boots between the air filter and t-body for cracks/holes. Replacing the air filter might've formed cracks in 'em. Just another thing to look at.
 
BlueCruiser84 said:
Definitely sounds like a vacuum issue. I would quadruple check all your lines. Even if you didn't touch them.
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Since they were on my list to replace anyways I'm just going to go ahead and change them all out to new silicone so I can cross a vacuum leak off my list. I know that the larger tubes are 6mm and 10mm, but I haven't been able to definitively determine if the small lines are 3 or 3.5. Which is it?
 
BlueCruiser84 said:
I think the smaller hoses are 3mm.

Could you have cracked a sparkplug porcelain, or not gapped one correctly?
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The plugs were all pregapped at .031 and I double checked them before installing to make sure. Being used to working on boxer engines and v6's where you need to be an olympic gymnast to access several of the plugs, I don't think there is any way that I could have cracked a plug. The 22re was the easiest plug change I've ever had.
 
backing down your idle will also show if you have a dead spot in the afm.
it hits the dead spot, increases fuel because the ecu thinks it is dying.
hits the good area but at to many rpms, so it backs it back down.
that is the vroom vroom at idle.

you can pop the top off and clean the contact with a pencil eraser.

at least that is what it was with mine.
 
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