Question about 1986 Toyota MR2

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A/C on 1986 MR2 has a leak. Dealer says only way to replace leaking valve is to install a whole new air conditioner.

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This depends on where the leak is. Most shops can run an ultraviolet dye through the system to check for the exact leak. This is done with a fluorecent light and can pinpoint just exactly where the leak is coming from, compressor, condenser, etc. Then you can decide what part to replace.

Posted on Oct 06, 2009

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This is not true. If you can describe where approximately the leak is, I can walk you through the repair.

Posted on Oct 06, 2009

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1 Answer

What size of engine does a 1986 Toyota MR2 have?


their were 3 engines for the gen 1 mr2 a 1.5 --1.6---1.6 supercharged
Toyota MR2 Wikipedia the free encyclopedia

Oct 05, 2016 | 1986 Toyota MR2

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How to fix air conditioner in 1985 toyota hiace


My 1986 would leak. The HP and LP hose coonections to the compressor where lose. Tightened up and stopped most leaking. I added leak detector and found the LP fill connection Schrader valve seat was bad. Put in a new Schrader valve (bought off ebay for cheap- but a couple of extras) and all leaks stopped. Night not be compressor itself. Have a pro check the system for leaks.

Jan 29, 2014 | 1985 Toyota Pickup

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Toyota MR2 spyder engine failure


It seems a bad idea , Just doing a good repair is like new :

replace head valves seals
replace head gasket , also check head plain
check cylinders for wear
repalce piston rings

Jul 07, 2017 | 2005 Toyota MR2 Spyder

1 Answer

My 1986 toyota Mr2 has a horrible synthetic oil leak. i believe its coming from the crankshaft pulley seal. can i take the crankshaft pulley off the engine without removing the engine from the car?


yes if its in the front but it more like the back one you might just drop the oil pan and do it if you have room to get the iol pan down

Mar 29, 2011 | 1986 Toyota MR2

1 Answer

Air conditioner stopped cooling. Dealer diagnosed evaporator leak, replaced the evaporator assembly, expansion valve, drier, evacuated and charged the AC system. One week later, AC stopped cooling,...


It could be that there was more than one leak and the dealer found only one. The AC system has two pressure switches to protect the compressor from damage---a low press. switch cuts off the compressor when there is not enough refrigerant in the system, the high switch cuts off when pressures get so high they could blow out the seals. Both are a result of a leak--refrigerant leaks out and air can leak in. Air will compress and when it does, it gets hot--so no cooling, and pressures go way up. So the compressor may have been stopped by those protective switches.

Of course, there could be a bad relay or other circuit malfunction.

Another possibility is that the compressor sat too long before being repaired (but we are talking about weeks going by here, not days). The air and moisture (humidity) that leaks into the system during this time creates acids that will attack the metal reed valves in the compressor. On restart, the damaged metal valves eat themselves in short order. If this is the case, the compressor ran until it seized and will need to be replaced. This particular problem is impossible to diagnose. So the dealer may have done his best.

Feb 12, 2011 | 2002 Honda Accord

1 Answer

I just bought a 86 MR2 it starts right up but then immediately dies. The previous smog test called it a gross polluter.Any ideas?


could be a mass air flow sensor problem, or a manifold pressure sensor problem. may have several major vacumn leaks that are used to sense and control fuel injection supply pressure and fuel flow. Might check manifold pressure. Check vacumn. inspect lines. there are several lines on air flow inlet. there are several vacumn control valves also. Would suggest obtaining an emmisions line chart. There is usually a decal showing the hose routing on the vehicle some where in the engine compartment.

Oct 14, 2010 | 1986 Toyota MR2

2 Answers

Car starts fine, when I push on pedal it lulls or struggles for gas, 1986 new yorker, I can still drive on road but have to pump pedal to keep motor accelerator


Make sure the carburetor is bolted down securely so that no air is leaking in under it. Make sure the screws around the top of the carburetor are secure.

Being careful, get your head down into the engine compartment while the car is idling, listening for an air leak.

Take an unlit propane torch that has the valve open, and pass it along all the intake component mating surfaces. When you get to a leak, fuel from the torch will pass through the leak rather than regular air, and the engine will speed up a little (or a lot). Point it at all vacuum hose ends (both ends of each hose).

Jun 15, 2010 | 1986 Chrysler New Yorker

1 Answer

My 86 toyota mr2 over heats about 10 minutes into running it. the anti-freeze leaks out from around the head gasket but the oil and the anti-freeze isn't mixed together. i'm not sure if i should replace...


Best bet is the gasket. After removing the head have it serviced professionally, replace thermostat and water pump and timing belt while in there

May 03, 2010 | 1986 Toyota MR2

1 Answer

Head gasket was leaking on my 86 mr2 Replaced the


Check all the wiring connections that you loosened or took off when you removed the head. something is loose or disconnected ,eg., ground wires .
Make sure you have spark at spark plugs whemn cranking ,and fuel pressure.
Did you try spraying starting-fluid in the intake, see if the engine runs for a little bit.
Compression to be anything above 100 psi will firean engine ,sometimes lower too.

Nov 01, 2009 | 1986 Toyota MR2

1 Answer

Oil leak


Pull the distributor out & examine the o-ring that is at the base of the dist where it slides into the cyl head. If the o-ring is compromised, oil will leak there.

Sep 26, 2008 | 1986 Toyota MR2

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