Idles at 1250 RPM

Propane, Butane, LPG, GPL, C3H8, C4H10
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LPGTE21
Posts: 6
Joined: Sun Feb 06, 2011 1:58 am

Idles at 1250 RPM

Post by LPGTE21 »

I have a 1982 Toyota 3TC with Wiseco forged 88mm pistons 7.5CR a Schneider mild cam with a Model E converter and 200M-2-2 carburetor, MSD 6AL with blaster coil and CB Performance Black Box timing computer. I cannot get the car to idle below 1250 RPM. The car is currently running normally aspirated waiting on the intercooler and piping to connect to the T3 48/63 Ebay turbo. Is the 200M too large for my 1.9 liter to idle at 600-700 RPM? The idle screw is backed all the way out and the idle mixture screw lower the idle to about 1000 RPM when screwer all the way in "Rich".
[youtube]https://studio.youtube.com/video/r0dni6K6NSI/edit/basic[/youtube]

C3H8
Posts: 1064
Joined: Fri Sep 09, 2005 11:23 pm
Location: Winnipeg, Canada

Re: Idles at 1250 RPM

Post by C3H8 »

The mixer size is fine. There is usually only one reason an engine idles fast. You have a vacuum leak somewhere downstream of the mixer. Barring that on rare occasions a sticking or loose throttle plate. I would say 90% chance of a vacuum leak. Start looking for a sucked in intake gasket, throttle plate gasket, leaking egr gasket or a port that plug or hose has come off of.

storm
Posts: 699
Joined: Wed Jan 10, 2007 10:10 pm
Location: NSW, Australia

Re: Idles at 1250 RPM

Post by storm »

The link you posted doesn't go anywhere except an error page.

C3H8 is spot on, spray a liberal amount of soapy water or brake cleaner at all gasket locations and listen to the engine. When it changes you have found a leak.
Fuel flow requirements calculations
Engine air flow requirement calculation: CFM = Cubic Inches x RPM x Volumetric Efficiency (VE) ÷ 3456

LPGTE21
Posts: 6
Joined: Sun Feb 06, 2011 1:58 am

Re: Idles at 1250 RPM

Post by LPGTE21 »

The link should be to a YouTube video titled "Toyota 3TC turbo propane first start" posted on June 17.

storm
Posts: 699
Joined: Wed Jan 10, 2007 10:10 pm
Location: NSW, Australia

Re: Idles at 1250 RPM

Post by storm »

LPGTE21 wrote:
Sat Jun 20, 2020 8:29 am
The link should be to a YouTube video titled "Toyota 3TC turbo propane first start" posted on June 17.
Should it?
LPGTE21 wrote:
Wed Jun 17, 2020 1:31 pm
[youtube]https://studio.youtube.com/video/r0dni6K6NSI/edit/basic[/youtube]
The link doesn't go anywhere and looking at the link address if I signed in as you I'd be taken to your YouTube studio page where you do editing and uploading. Using a different browser that you have never been to YouTube in click on that link and see where it takes you.
Fuel flow requirements calculations
Engine air flow requirement calculation: CFM = Cubic Inches x RPM x Volumetric Efficiency (VE) ÷ 3456

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