Low Idle?

"HammerheadFistpunch" (hammerheadfistpunch) 08/21/2013 at 12:21 • Filed to: halp

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Any ideas what would cause a low idle on a fuel injected engine. I have a Toyota 1FZ-FE powered land cruiser and there seems to be a problem with A: random stalling out, i.e. it just stops running without shutting down the electronics or throwing a code. It seems to run fine when it idles fine and stalls out when it idles low. Its a new 3rd party distributor, new plus and wires. I was thinking the Fuel pump relay or fuel pump? Anything else I should be looking for

TheBloody, Oppositelock lives on in our shitposts. > HammerheadFistpunch 08/21/2013 at 12:24

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Check the fuelfilter, you could of put in some bad gas.

Hermann > HammerheadFistpunch 08/21/2013 at 12:26

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IAC Valve? Happened to me once, changed the Idle Air Control valve and it went back.

HammerheadFistpunch > TheBloody, Oppositelock lives on in our shitposts. 08/21/2013 at 12:26

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There is a sock filter on the pump I am going to be changing out, but I've ruled out bad gas since it seems to happen pretty regularly and I only fill up at reputable stations.

ncasolowork2 > HammerheadFistpunch 08/21/2013 at 12:27

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As a way of isolating the problem try keeping the revs up just slightly when stopped. If you're not stalling out then it probably does have something to do with whatever is going on while ilding.

Mattbob > TheBloody, Oppositelock lives on in our shitposts. 08/21/2013 at 12:29

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this and make sure the intake path is clear and filter clean. Maybe throttle position sensor or MAF going?

Frank Grimes > HammerheadFistpunch 08/21/2013 at 12:31

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Clean out the Idle Air Controller.

HammerheadFistpunch > ncasolowork2 08/21/2013 at 12:32

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it will stall on the freeway, so I don't think that its related to simply dropping too low on the revs.

HammerheadFistpunch > Hermann 08/21/2013 at 12:37

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on a cruiser? I have looked into what an IAC does here and how to troubleshoot it, and I will...but would it cause a problem when the engine speeds are up, as in highway speeds? The two seems to be related.

doodon2whls > HammerheadFistpunch 08/21/2013 at 12:41

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(Paging Click and Clack, the Tappet brothers)

What year FZJ80 ?

Possibly a misbehaving fuel pressure regulator ?

Have you checked the wiring to the O2 sensors ?
http://forum.ih8mud.com/80-series-tech…

Is your intake hose cracked ?
http://www.4wdaction.com.au/forum/viewtopi…

Those were the first two hits on google search for "stalling Toyota 1FZ-FE"

HammerheadFistpunch > doodon2whls 08/21/2013 at 12:44

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1997, distributor (as listed above)

The o2 sensors are 20k old and the truck ran fine until recently. I will check the intake track, but it looks perfect.

Nibbles > HammerheadFistpunch 08/21/2013 at 12:46

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TPS would be a good thing to check for sure. If you're not registering the proper position, it could lean out the mixture until it stalls out.

Does it stall when cold? If not, a sensor is most likely the culprit.

HammerheadFistpunch > Nibbles 08/21/2013 at 12:48

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this video was a cold start this morning. I have seen a code 1 time and it was a Camshaft position sensor but that was replaced with the distributor...so its either a crap sensor (could be, its 3rd party chinese) or its not really the CPS thats at fault.

Saracen > HammerheadFistpunch 08/21/2013 at 12:51

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What kind of mileage does your FZJ80 get?

HammerheadFistpunch > Saracen 08/21/2013 at 12:51

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normal, i.e. 13

Nibbles > HammerheadFistpunch 08/21/2013 at 12:51

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A failing CPS could definitely cause this. IIRC it's the only sensor the system listens to when in open loop. It is used to calculate ignition timing, so yeah it could be the cheap Chinese knockoff.

HammerheadFistpunch > Nibbles 08/21/2013 at 12:55

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hooray! I paid for it but didn't get to choose it. I bought it from a guy who had the problem and replaced the dizzy to fix it, but I found out when it arrived that it wasn't an OEM part. $300 for junk.

Nibbles > HammerheadFistpunch 08/21/2013 at 13:06

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DAYUM

Can you test it? If you can get to the leads easily, hook a multimeter up and see if you're getting the proper resistance at all times. If you see it fluctuate around the same time that idle drops/it stalls, you know that's definitely your culprit.

(Of course I'm guessing that it runs on resistance. Not entirely sure. Either way, whether it be resistance or voltage, a multimeter test should be able to tell you yes or no)

EDIT: You could also check to see if the CPS is wobbling. If it can't read the hash marks (too far away or too close) it could act up as well.

Hermann > HammerheadFistpunch 08/21/2013 at 13:11

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It was also a diesel truck, it was a 7th gen F-series, though. I know these things vary a lot from brand to brand, but it makes sense.

May not cause problems on highway speeds because it actuates on idle only, AFAIK. But I'm really what people call a newbie. I know near to nothing about these things, so please correct me if I'm wrong, guys. It seems to be kind of stuck when in idle, closing the valve. But it allows you to throttle, so it shouldn't affect anything beyond idling.

FJ80WaitinForaLSV8 > HammerheadFistpunch 08/21/2013 at 13:16

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I have a somewhat similar problem with my FJ 80 except that it only has a low idle when shes warming up. So I just left foot break for the first couple miles of my drive and then she idles fine after driving 3-4 miles. I suppose I should look into getting her fixed but left foot breaking has proven too easy a fix.

Let us know what you figure out.

HammerheadFistpunch > Nibbles 08/21/2013 at 13:18

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the cps is buried in the dizzy, not much chance of seeing it in action.

HammerheadFistpunch > FJ80WaitinForaLSV8 08/21/2013 at 13:19

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if it was as easy as letting it warm up, I wouldn't bother, its when it stalls out randomly on the freeway or making a turn thats a problem.

Nibbles > HammerheadFistpunch 08/21/2013 at 14:01

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Butts.

If the CPS wires come out of the dizzy anywhere, you could poke through the shielding...

Matt Urban > Hermann 08/21/2013 at 14:06

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My Tacoma is doing this right now. The valve is probably covered in carbon and when the engine is cools off, it hardens and keeps the valve from opening when you cold start it. Sometimes you can clean it and fix the issue, but in my case I have cleaned it to the point that i need to replace it.

KMarino > HammerheadFistpunch 08/21/2013 at 14:16

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I had a problem with low idle/ stalling on my mustang. I cleaned the throttle body and disconnected the battery to re-train the idle. Both were easy fixes and solved a lot of the issues. I don't know if your idle is electronically controlled but could be worth looking into to see if there is a retraining sequence.

HammerheadFistpunch > KMarino 08/21/2013 at 14:23

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its a cable actuated throttle.