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1985 Other Toyota Models Toyota 22R Idle Issues

Tiny
MAXIMMM
  • MEMBER
  • 1985 TOYOTA
  • 4 CYL
  • 2WD
  • MANUAL
  • 120,000 MILES
Hi, my Toyota 22r motor has problems idling since it was converted to run on LPG. Basically the engine tick over speed ranges from barely-running 500rpm to 1500rpm. This happens whether the engine in running on petrol or LPG. Also, there is a strange, intermittent sucking noise coming from the region of the carb - also since LPG conversion. Finally, on LPG the car stalls on downshifting whilst the clutch is down and backfires on braking. Is it the timing or do I need uprated HT leads and distributor to cope with LPG?
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Saturday, November 15th, 2008 AT 7:45 PM

10 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
The 22R motor has adjustable valves. This is probably where your ticking is coming from. When you say it backfires, is it out the tailpipe or out the air cleaner? The stalling problem may be your LP regulator is out of calibration. Try changing the vacuum line to a different port on the intake manifold. The regulator needs full vacuum.
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Saturday, November 15th, 2008 AT 9:49 PM
Tiny
MAXIMMM
  • MEMBER
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1) When I refer to tick over - I mean the idle speed of the engine (sorry, I'm British and live in Australia so the terminology is a little different!) The idle speed just seems to vary between 500-1500rpm without any apparent cause.
2) I believe the backfire is out of the tailpipe as I only really hear it when I'm passing a building so that the sound reflects back off it.
3) The regulator is just connected to the join between the pipe from the airbox and the thin metal housing that sits above the inlet manifold - it's not mounted directly onto the manifold at all?
4) Would changing the HT leads, distrubutor cap, rotor and spark plugs make a difference?
5) Thought you might like a picture of a koala as I don't think you get too many in the USA!


https://www.2carpros.com/forum/automotive_pictures/271873_DSC00299_2.jpg


Top of engine.


https://www.2carpros.com/forum/automotive_pictures/271873_DSC00300_2.jpg


LPG injection point into inlet hose.


https://www.2carpros.com/forum/automotive_pictures/271873_DSC00298small_1.jpg


[img]
A koala in my garden.
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Saturday, November 15th, 2008 AT 10:30 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
WOW, a koala, I think I had one of those in my backyard last week. Ya right, I'm in Minnesota, USA. I was working with a guy from Auckland, New Zealand a couple nights ago. Anyway, on to your problem. You could go ahead and change HT parts, it can't hurt. You will usually notice a high voltage problem under a load and it doesn't take any more spark to fire LP than it does gas. Looking at your pictures, is the air cleaner well sealed? It's the vacuum of the engine that actuates the LP regulator. Any air leaks between the carb and the regulator will affect idle.
When the engine is running on LP, the only part of the carb it is using are the throttle plates and if the irratic idle idle occurs with both fuels, we have to look elsewhere. Try unplugging or blanking off the EGR valve and see what happens. In the interim, I'm going to do a little research.
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Saturday, November 15th, 2008 AT 11:48 PM
Tiny
MAXIMMM
  • MEMBER
  • 5 POSTS
Hi
Sorry for delay in getting back to you - I've checked and the engine doesn't have an EGR valve as I think it's just too old. Am renewing HT leads and spark plugs tomorrow and will probably have to change over the rotor etc as well.
How did your research go? I was wondering if the auto-choke is coming on intermittently but would this affect LPG as well as petrol running?
Cheers
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Wednesday, November 19th, 2008 AT 6:51 AM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
Info search for is not going well. There is very little available for aftermarket conversions. I am assuming, the LP system you installed was a "kit". If so, what make is it or where did it come from? Your question on the choke. On petrol, the closed choke butterfly will make the engine run rich. On LP, closed butterfly will make it run lean. The reason being, the LP fuel regulator relys strictly on air flow volume to regulate the fuel/air mixture. A closed or partially closed choke is a flow restriction thusly reducing LP intake. The last conversion of this sort I worked on, many years ago, we locked the choke butterfly open, started the truck on LP and then switched to petrol. I'll keep looking, The make and manufacturer of your system may help.
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Wednesday, November 19th, 2008 AT 3:56 PM
Tiny
MAXIMMM
  • MEMBER
  • 5 POSTS
Hi
Have been doing some research on net and I'm convinced that my mechanic here in Oz is talking out of his rear - my engine DOES have an EGR valve! I assume the best thing I can do is to replace it?
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Friday, November 21st, 2008 AT 9:34 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
If you can "block off" the EGR with a gasket, and test run the car, it could save you the cost of a new valve if it doesn't help. Also, make sure the old valve is clean and not hung up.
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Saturday, November 22nd, 2008 AT 9:38 AM
Tiny
MAXIMMM
  • MEMBER
  • 5 POSTS
Which bit do I block off - the large pipe that connects to the main part of the engine or just the vacuum hoses?
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Saturday, November 22nd, 2008 AT 8:15 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
You want to some how block off the valve where it enters the intake manifold. If you can't do this, then plug where the large pipe enters the valve.
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Sunday, November 23rd, 2008 AT 12:25 PM
Tiny
RICHTOEFEN
  • MEMBER
  • 1 POST
First and foremost. Replace the gasket and or the the oxygen sensor on the exhaust manifold. Very easy to do.

Also clean out the muck. And there will be alot of it. Just inboard of the throttle body. You can do it completely by removing the silver aluminum intake chamber that has 22r written on it. The throttle has a flipper flapper and the muck builds up sooo much that idle is affected.
If you dont want to spend much time and effort get throttle body cleaner and spray in there. NOTE: your poor engine will ingest alot of muck this way. And will be very mad at you.
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Saturday, June 20th, 2009 AT 9:01 PM

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