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post #16 of 26 (permalink) Old 01-29-2017, 01:36 PM
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If there's one thing I could easily change myself about the startup RPM of my Tundra it would be the idle speed.
It starts out really high (1,500?) but settles down once the engine management system is satisfied.
I'd be a lot happier if the idle speed were easily adjusted by the owner.

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post #17 of 26 (permalink) Old 01-29-2017, 02:18 PM
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Originally Posted by toymdt View Post
For OP, I'd like to know the idle readings at idle in park and drive with foot on brake both cold start and hot. Have to know this before we can determine if there is even an issue. You cannot base the idle specs with the truck moving.
That's what I took away from the OP's first statement. He's reading the rpm's from a moving vehicle!

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post #18 of 26 (permalink) Old 01-29-2017, 02:54 PM
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Originally Posted by l1tech View Post
Judging by the replies here it seems no one remembers what a choke is
You mean like on a go-cart or lawnmower?


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post #19 of 26 (permalink) Old 01-29-2017, 02:58 PM
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It sounds like he's concerned with the engine speed while moving, but the foot off the gas. It isn't going below 1100 RPM's while moving, foot off the gas (30mph).

I don't think engine RPM's would go much below that while in motion. With the foot off the gas, while moving, I'd think it would shift down, using engine breaking a little bit. Granted, it would have to be a long distance of no foot on the pedal before you slow the truck significantly without using brakes.

I'm wondering if he's in SP mode. I usually have to use braking a little, as there aren't many long runs where I can basically coast to a speed as slow as 30mph.

If I drive on a cold engine, it's a different story. From a stop, I can let off the brake pedal and get some decent speed going, without applying any gas. Like others have said, the engine will rev higher no matter what until it's completely warmed up. Usually takes me a couple/few miles at least, before things get normal.


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post #20 of 26 (permalink) Old 01-29-2017, 05:16 PM
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Originally Posted by Jaj23 View Post
You mean like on a go-cart or lawnmower?
Yes but I'm specifically referring to chokes that were on carbed autos. You always had to pump the gas once or twice to set the choke before you started them when they were cold and then they would idle ~2000 rpms, you'd stab the accelerator really quick and then they would go down to ~1500 rpms. They wouldn't hit idle speed until the engine was warmed up enough to get the choke to kick off. Modern fuel injected engines also do this but with no input from the operator. With you being in Gilbert these engines never go to high idle much of the year because it doesn't get cold enough to warrant the high idle. I get a lot of customers starting around DEC that start complaining of high idle because it finally gets cold here and they aren't used to their cars idling at 1500.

I'm not judging...I'm just sayin


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post #21 of 26 (permalink) Old 01-29-2017, 05:23 PM
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It seems so long ago... Back in the carb days, a plate literally choked off the air intake side of the carburetor, causing more fuel from the all the jets to get sucked into the engine. There was a little cam to open the butterfly more, upping the idle. Then they started using a fuel enrichener. Much more efficient. Now none of that matters with fuel injection.

Either way, cold engine is gonna idle pretty high for a bit. I just got back from running about the city. It's in the 50's, and the idle was almost 1500 initially. Took several miles before everything became normal. I let her warm up for at least a few minutes in the driveway. Just an old habit.


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post #22 of 26 (permalink) Old 01-29-2017, 05:51 PM
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Originally Posted by l1tech View Post
Yes but I'm specifically referring to chokes that were on carbed autos. You always had to pump the gas once or twice to set the choke before you started them when they were cold and then they would idle ~2000 rpms, you'd stab the accelerator really quick and then they would go down to ~1500 rpms. They wouldn't hit idle speed until the engine was warmed up enough to get the choke to kick off. Modern fuel injected engines also do this but with no input from the operator. With you being in Gilbert these engines never go to high idle much of the year because it doesn't get cold enough to warrant the high idle. I get a lot of customers starting around DEC that start complaining of high idle because it finally gets cold here and they aren't used to their cars idling at 1500.
Older Quadrajets (or at least the one on my 69) requires the operator to press the accelerator down to the floor letting up and then pressing down halfway. This will set the choke for the engine to start correctly.

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Originally Posted by tomscigars View Post
It seems so long ago... Back in the carb days, a plate literally choked off the air intake side of the carburetor, causing more fuel from the all the jets to get sucked into the engine. There was a little cam to open the butterfly more, upping the idle. Then they started using a fuel enrichener. Much more efficient. Now none of that matters with fuel injection.

Either way, cold engine is gonna idle pretty high for a bit. I just got back from running about the city. It's in the 50's, and the idle was almost 1500 initially. Took several miles before everything became normal. I let her warm up for at least a few minutes in the driveway. Just an old habit.
Wasn't that long ago and they are still sued to day in some applications.


1990 (General public) : Oldsmobile Custom Cruiser, Buick Estate Wagon, Cadillac Brougham, Honda Prelude (Base Model), Subaru Justy
1991 (Police) : Ford Crown Victoria Police Interceptor with the 5.8 L (351 cu in) V8 engine.
1991 (SUV) : Jeep Grand Wagoneer with the AMC 360 cu in (5.9 L) V8 engine.[11]
1993 Mazda B2200 (Light Truck)
1994 (Light truck) : Isuzu[12]


https://en.wikipedia.org/wiki/Carburetor

Brit video of how a carb works

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post #23 of 26 (permalink) Old 01-29-2017, 05:57 PM
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Originally Posted by pmd1969 View Post

Wasn't that long ago and they are still sued to day in some applications.


1990 (General public) : Oldsmobile Custom Cruiser, Buick Estate Wagon, Cadillac Brougham, Honda Prelude (Base Model), Subaru Justy
1991 (Police) : Ford Crown Victoria Police Interceptor with the 5.8 L (351 cu in) V8 engine.
1991 (SUV) : Jeep Grand Wagoneer with the AMC 360 cu in (5.9 L) V8 engine.[11]
1993 Mazda B2200 (Light Truck)
1994 (Light truck) : Isuzu[12]

I was attempting to not show my age. It seems like yesterday that carbs were commonplace. But, in your examples, the most recent is twenty three years old. It is true, carbs are still used, but I've only seen them in lawnmowers and some tractors. Maybe a dirtbike and such.

Yep, we're old.


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post #24 of 26 (permalink) Old 01-29-2017, 08:17 PM
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Originally Posted by tomscigars View Post
I was attempting to not show my age..
I used to rebuild them for a living, hows that for showing your age.

I'm not judging...I'm just sayin


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post #25 of 26 (permalink) Old 01-29-2017, 10:01 PM
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Quote:
Originally Posted by tomscigars View Post
I was attempting to not show my age. It seems like yesterday that carbs were commonplace. But, in your examples, the most recent is twenty three years old. It is true, carbs are still used, but I've only seen them in lawnmowers and some tractors. Maybe a dirtbike and such.

Yep, we're old.
What's this "we" shit? lol. My 99 Valkyrie has six carbs from the factory in it . There are plenty of motorcycles that have them since puters and FI are expensive.

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post #26 of 26 (permalink) Old 01-29-2017, 10:05 PM
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Originally Posted by pmd1969 View Post
What's this "we" shit? lol. My 99 Valkyrie has six carbs from the factory in it . There are plenty of motorcycles that have them since puters and FI are expensive.
Time isn't our friend!
Ugh once I had to synchronize the carbs on a Gold Wing, which is the same engine (I think, at least at the time). Six carbs. But, my mercury gauge was for four carbs, so I had to do four, then the last two. It literally took all day. At least with Harley's, it was only one carb. Easy!

Wow I've helped derail another thread. I guess it's my "Thing" now. Niiiiice


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