Idle rpm in gear too low

I've never known a vacuum leak that could cause a low idle.
Ahigh idle, sure, most of the time, but a big leak, that usually induces a stall.
I've never known a big leak to create a low idle, that feels like a stretch to me.

There is only one thing I have ever found to be at fault with a low idle and that is a cylinder running below its potential.
Under load and at speed it can ride open the coat tails of the others but at idle, that weak player will show his cards.

Fire it up, set the idle speed to spec in park/neutral (850?) then start pulling wires, one at a time and see if they all produce the same amount of work.
My money is that one of the cylinders is not pulling as hard as the rest.

Could be as simple as an oil leak into a spark plug well shorting out the plug or something as sinister as a burnt valve, but diagnosing the actual cause before pulling the trigger on the parts canon, is a much more satisfying method of reserve depletion.

All TV's are a negative influence on cash reserves, 4WD just cuts the commuting time in half!

all that definitely makes some good sense...cant wait to find out the issue

So I was just having some similar issue and it was a spark plug that was fouled and gap was to large. The spark plug was showing a fat blue spark outside the cylinder but once installed if did not fire.

Hmmm, same thing happened to be recently. After amost 70K after engine rebuild it started doing the same thing. Cold start perfect, idle down to 900rpm stick it in drive and the idle drops, engine shakes like a SOB then stalls. If I pick the idle up it is better but after up to operating temp if I am at a light and in gear it will slowly start going down in idle with a tiny bit of shake. Once I apply gas she runs fine. Checked all hoses, fuel lines, and check engine lights. Wasn't considering a spark plug problem. Was your problem ever solved?

My Toy

Honestly man I can't remember what it ended up being but I did get it sorted out. It ended up being something small but I don't remember what. Nothing crazy either.
I don't own the van anymore.

I'm sure you checked the intake tube for cracks....right? This is the classic symptom for intake tube cracks. Try squeezing the tube during idle to see if the same thing happens. If it does, remove the intake tube and inspect around the ribs while squeezing/stretching. Tim

Thanks guys. So Tim, when you say tube you mean the intake boot?

MT

If it is the boot and is not salvageable is there any place I can get one?

MT

The rubber tube that goes from the Air Flow Meter to the Throttle Body. I don't know if they are still available. Last one I bought new was ~ 15 years ago. Tim

Quote:

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Originally Posted by MyToy

If it is the boot and is not salvageable is there any place I can get one?

MT

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Checked the boot. It is ripped almost completly around the air intake side. Not sure if I can glue it.
A new one is best but I am not finding that anywhere.

MyToy

I just checked too. It's Toyota part #17881-73020. Even megazip.com says "discontinued". Major bummer. Looks like used is your only option. There are guys who have repaired using silicone & tape, but to me that's pretty sketchy. I still use my van for a daily driver business vehicle, so this parts situation is getting serious. My wife and I have been talking about switching to a different vehicle for this very reason. Good luck with your search. Tim

It's basically impossible to find a new OEM air intake hose. Supposedly "Dayco Air Intake Hose Toyota Tarago & Spacia YR22 2.2L 4Y 4YEC" (DAH122) works but you'll have to find a vendor in Australia that's willing to ship to the US. There used to be someone on eBay that would https://www.ebay.com/itm/222892268538, but there are no current eBay listings that ship to the US.

I just sent an email to "Auto Parts Guys" in Australia asking if they'd ship to USA. I also asked if they would consider a bulk order of 10 or more. If they respond I'll let you know what they say.

The aussies have the toyota tarago 2.2, which I think has the same one, and it is available aftermarket. The trouble will be the shipping…
like the dayco dah122
https://www.ebay.com.au/itm/403596050790
Or maybe https://www.ebay.com.au/itm/233350109700

Well sounds like at least something. For I am in Tim if that works.

I think I am going to temporarily use a scat hose that I used on my airplane. These hoses are not rubber but more of a fabric. FAA approved for fire, spiral spring in side for strength and flexibility. The side port I can cut out and seal to attach the other hose to. And they last for ever.

I will get to the hangar and see if I have the right size. I have an assortment of them. Will keep you posted.

MT

Thanks for the links. Unfortunately nobody offers shipping to USA, but I suspect somebody might if the order is big enough. I personally would want 3 or 4 of these. If anybody else is interested, please state how many and how firm your commitment is. The bigger the purchase the more likely they are to agree. Even if combined I expect shipping to be high (I'm guessing $30 or so each). Tim

PS: I'm hesitant to order in volume without 1st verifying these will fit our vans. Has anybody actually purchased and installed one of these? If so, what are your impressions?

Quote:

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Originally Posted by timsrv

I just sent an email to "Auto Parts Guys" in Australia asking if they'd ship to USA. I also asked if they would consider a bulk order of 10 or more. If they respond I'll let you know what they say.

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Auto Parts Guys responded saying the Dayco tubes are No Longer Available. Major bummer, by the time I found out about these they are all gone. Maybe I can talk one of the eBay guys to ship whatever they have left to me??? MT, please post a picture of what you come up with and report back with how it works.

Hey Tim:
Wow, now that sucks.

OK, I will get over to the hangar and match one up. I will let you know how it works and send pics.

For sure it won't look like a factory product.:no: But who cares if it works.

MT

Oh and by the way I am in for one for sure.

MT

Yea, intake boot rips suck especially for cars, like our Vans, that don't have any available!! I have not inspected mine but I should considering my van has mostly? been running lean ever since I got it; that or a vacuum leak but I have not verified the correct idle speed too.

I should check that, and if it is torn, then yes I'd be down to order one of these intake boots for science! :silvervan: