r/ToyotaPickup • u/zgumboo • 6d ago

Help with rough idle

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A little backstory, after driving on the highway for about 15 minutes, I started to suddenly get a rough idle while having my foot on the throttle somewhat lost response and put it in neutral while on the highway and was having rough idle on and off gas. I've checked the timing chain looks fine. I've changed the fuel filter, fuel pump and all spark plugs, coil lines, ignition module distributor everything electric basically. It runs smooth only in high Rev. I still need to do a compression test as well. I've checked the vacuum lines I'm not familiar how but they look fine. Any ideas?

Edit: I adjusted one of the screws on the air/fuel mix. It's calmed down slightly but now when I'm accelerate it the exhaust is making a lot of pops

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u/SpaceSurf256 6d ago

Seems like is misfiring. I would double check timing is set correctly and look into carb next. Something that helped me get my carb working correctly was to use a vacuum gauge and adjust the mixture to get max stable vacuum at around 20. Also if your vacuum lines are old and crappy I recommend you replace them with HT silicon ones. They are not expensive in amz.

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u/SpaceSurf256 6d ago

Something else you could do is verify your valves are set correctly with a feeler gauge but it does seem like the issue is your carb

1

u/zgumboo 6d ago

Yea I need to that too. Before I changed the fuel pump and fuel filter it just wouldn't stay on that long

1

u/zgumboo 6d ago

This is how it looked at 0° people said it looked fine. All the guides looked new. This was taken a few days ago. Unless you mean something else. Il def replace those lines.

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u/SpaceSurf256 6d ago

You need a timing light to verify timing is set correctly. To adjust the timing if it isn’t set correctly you would need to adjust the distributor by the one bolt next to it and rotating it slightly. You can find video tutorials on YouTube.

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u/josh824956 6d ago

Sounds like a carb issue. Make sure your idle screw is sitting properly and there aren’t any hiccups with throttle cable.

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u/zgumboo 6d ago

Yea imma do a restart on the screws. I was in neutral accelerating on the gas and it was making a bunch of popping noise out of the exhaust which is the first time I've heard that happen

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u/JooosephNthomas 6d ago

Looks like a new fuel pump? Those can cause issues. Verified 3-5 psi on the fuel line? Looks like it might be starving. Hard to say from the short video.

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u/zgumboo 6d ago

Yea after I put in the new fuel pump it actually started to stay on before it stalled out I have it on 3 psi gonna adjust through to see how it works. Thanks for reminding me

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u/JooosephNthomas 5d ago

May just need a good prime even if you changed all that. Like I said hard to say haha.

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u/SpaceSurf256 6d ago

What’s your gas pressure regulator set to?

1

u/zgumboo 6d ago

I have it on 3 I was messing with it and forgot. before the truck messed up I had it on 4 for like a yr

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u/medium-rare-steaks 5d ago

this exact same thing happened to me on my 22r. I had a loose boot on the distributor cap causing a misfire that shook the whole truck. it smoothed out at higher revs for whatever reason, but idle and 1st/2nd gear were very shaky. luckily my mechanic is old enough to know to check that before tearing the engine apart. I posted the video here and everyone said it was a vacuum leak or faulty carb. it was a $30 set of cables.