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Old 12-29-2021, 11:10 PM #1
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Mystery warm start issue

2002 with 170k miles. Cold start, works perfectly, and drives as normal. When I park for example to get gas, it starts back up. If I park it for longer, say to go into a store for 10+min, it wonít start. It bogs and sputters, then dies. Kind of like itís running too richÖ? Each successive start attempt is worse, then it barely turns over.

After that, I wait about 45min, then it starts back up like normal, and runs perfectly.

MPG is the same as ever (-shitty).

Tail pipe is clean, not black. No smoke or anything.

When this first started, it was occasional. But months later itís every time.

It threw a p0171 code, but only once.

Iíve cleaned the MAF multiple times, throttle body, air filter.

Suspect peoples first guess is a vacuum leak, but this doesnít make sense to me, because thereís some kind of temp variable, it runs fine except for the warm start.

Ideas?

Thanks.
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Old 12-30-2021, 02:35 AM #2
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Mine would idle roughly after restarting after 10+ minutes. Turns out it was a bad fuel injector. Tried the fuel injector cleaner from the auto parts store, but that didn't work so ended up replacing the problem one. After that, no rough idle and good fuel trims.

I'd start with the fuel system cleaner, see if that helps at all.
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Old 12-30-2021, 07:08 AM #3
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Iím leaning towards a leaking fuel injector thatís sticking open when hot.

However, you mentioning it barely turns over after several start attempts sounds like itís starting to hydraulic. And no white smoke (not antifreeze) when it restarts seems like gas.

If you pull your dipstick does the oil smell like gas?


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Old 12-30-2021, 07:09 AM #4
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First, start off simple. I would go through all of your vacuum hoses. Start the engine up and carefully listen for hissing sounds. Next, I would try cleaning your IAC valve. Ive never done one on a 4runner but I have many other cars with success. I cleaned one on my daughters Camry last year because of a similar problem. Ill see if I can find a link with directions on how to do it. 199963 makes a good point as well about a leaky injector.

IAC Cleaning - Easy Method???

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Old 12-30-2021, 10:38 AM #5
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Forgot to mention I had tried the fuel system cleaner at least once.

Iíve searched in this a lot, and found (only) one guy with the same problem, and his ended up being a bad injector, so I think you guys are on to it.

IAC also seemed close, I may just try this as well.

Iíll also listen for vacuum leaks, not sure if Iíve tried this yet. No gas smell on dipstick.

I was thinking it might be something like the coolant temp sensor, although this would be a strange failure mode (gets progressively worse) for a sensor but it does seem to check the other boxes.
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Old 12-30-2021, 12:22 PM #6
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You could try giving it some throttle on a hot startÖÖ


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Old 12-30-2021, 12:26 PM #7
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Yes, tried various throttle inputs, all the way up to flooring it. Helps sometimes if I time it exactly right - right at ignition. Once itís stumbling itís over.
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Old 12-30-2021, 01:08 PM #8
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Mystery warm start issue

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Originally Posted by Jason_nakal View Post
Yes, tried various throttle inputs, all the way up to flooring it. Helps sometimes if I time it exactly right - right at ignition. Once itís stumbling itís over.

The fact that the more you try to restart It eventually barely turns over I think itís hydraulicing. I doubt the battery is dead since youíre not charging it to start it later.

How fast can can you pull plugs after a failed hot start?

What is your LTFT with a hot engine driving down the road?


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Old 12-30-2021, 02:07 PM #9
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I have changed the battery in the last ~6 months so good there.

I probably canít pull the plugs all that fastÖ

LTFTÖ?
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Old 12-30-2021, 03:26 PM #10
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I have changed the battery in the last ~6 months so good there.

I probably canít pull the plugs all that fastÖ

LTFTÖ?

Long Term Fuel Trim. Itís the parameter that triggers to too rich or too lean code. Itís part of the live data stream.


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Old 01-10-2022, 12:32 PM #11
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How would I/ the mechanic know one of the injectors is Ďintermittentlyí failing? Is there specific diagnostic equip theyíll need to use?

All indications are Iím going to have to spoon feed my mechanic, and Iím not sure what this ďokĒ mechanic has. Even though I live in a big city, Iíve yet to find someone good to work on this old truck.

Thanks.
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Old 01-10-2022, 02:29 PM #12
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How would I/ the mechanic know one of the injectors is Ďintermittentlyí failing? Is there specific diagnostic equip theyíll need to use?

All indications are Iím going to have to spoon feed my mechanic, and Iím not sure what this ďokĒ mechanic has. Even though I live in a big city, Iíve yet to find someone good to work on this old truck.

Thanks.
Resistance check all the injectors. For best results check them with the engine cold and at operating temperature. Spec is 13.8 ohms resistance at 68 degrees Fahrenheit.
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Old 01-12-2022, 07:57 PM #13
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Solved

Thanks for all of the input. I changed the coolant temp sensor, and two warm starts were normal/ as they should be. Looks like a fix!
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Old 01-12-2022, 08:58 PM #14
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Thanks for all of the input. I changed the coolant temp sensor, and two warm starts were normal/ as they should be. Looks like a fix!
Good stuff. I didn't know about this. Did you use a generic $9 sensor for the 3rd gen or an OEM one? I maywell have this problem, as my 1st start of the AM is great, but next warm start often dies unless I keep the R's up for a bit.




Google:

What happens when coolant temperature sensor goes bad?

A faulty ECT sensor can send a false signal to the onboard computer, resulting in an incorrect air-fuel mixture. For example, a faulty sensor can send a signal indicating the engine is cold when it is not, and more fuel will heat the engine quickly.


Edit - this is the location, right?


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Old 01-13-2022, 11:28 AM #15
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Yes, it sounds like you might have the same thing. Itís not a difficult part to change, you can do it in less than an hour. That said, itís also not expensive to get an OEM one, theyíre around $55 plus shipping (youíll also need 5 crush washers). I just went with the OEM. Less than $100 to fix something two mechanics couldnít (wouldnít bother, really) figure out.
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