Question about 1987 Toyota 4Runner

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1987 toy 4-runner,22re. failed smog,rough idle. stalls. won't idle at 700 rpm,stalls, 933ppm hc at idle.

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  • 2 Answers

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Posted on Jan 02, 2017

emissionwiz
  • 75005 Answers

SOURCE: high hc

you may need replace the catalytic converter, but 1st do this, clean the throttle body and idle airbypass valve, change the oil before the retest as well, get it as hot as you can before the test, hold it at a high idle prior to the test, this may squeak you by, as a 20 year smog tech these are the thing I did, if all else fails do the cat conv.

Posted on Oct 15, 2008

  • 398 Answers

SOURCE: 1990 toyota camry 4 cyl fails HC part of CA smog

try using 93 octane with some octane boost. get the good octane boost that cost about 7 or 8 dollars. Fill her up .drive her for about 200 miles so the octane boost can clean

Posted on Jul 14, 2009

  • 834 Answers

SOURCE: failed smog check

How well does the vehicle run?

Assuming that the engine did pass the EGR function test on the emission test results, and the MIL (Malfunction Indicator Light) or check engine light is not on when the engine is running, and if you are not sure when the last time it was that the engine had a complete tune-up, with distributor cap, ignition rotor, spark plugs, spark plug wires, air and fuel filters, then a complete tune-up would certainly help, and if the engine oil and oil filter have not been changed in a while, then they should also be changed before an emission test because long used engine oil traps carbon and it will show up as higher CO on the emission test because the emission analyzer will be able detect the higher CO from the engine oil through the PCV valve.

However, it would seem from those HC readings that there is a vacuum leak, and carefully inspect all of the vacuum lines for any cracks or damage, (especially the vacuum line to the fuel pressure regulator) because cracks in the vacuum lines seem to like to hide underneath the lines.

The emission label under the hood should have the vacuum line routing diagram printed on it, and the vacuum lines should all be checked to be certain that they are all connected correctly.

Here is the firing order diagram for that vehicle to help assist you tune-up the vehicle.


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Posted on Jul 10, 2010

  • 19 Answers

SOURCE: i have a 1991 toyota 4-runner at idle in park its

This sounds like a vacuum leak. Possibly at the brake booster. There is a check valve on the vacuum booster. Check it by pulling it out and see if you can blow thru it both ways. Air should flow freely in one direction and NO air passing thru the other way.

Posted on Feb 16, 2011

  • 158 Answers

SOURCE: My 1997 Honda Civic failed

Jose, I don't know if this will give you the answer you are looking for because there are many things to consider here. The exhaust gas recirculation valve (EGR) is one of the main things involved in reducing NO emissions. This valve is controled by the power control module. (PCM) This is your vehicles computer. The PCM monitors the vehicles speed and will command the EGR to open when the vehicle attains a certain speed, which is why the ASM test being done is recorded at two different speeds. At 25 MPH your vehicle failed the hydrocarbon (HC) emissions limit and this could be for a number of reasons. When is the last time you car was tuned up? Old spark plugs, wires, clogged air filters, oxygen sensors, leaking injectors (personal experience) or the PCV valve could be contributing to the results of the test. I guess that the easiest way to go is to tune up the engine replacing the spark plugs, wires, air filter and the PCV valve and don't forget to have the oil changed at the same time. Only then should have the vehicle retested and see what the results are. Should it fail again you may have to consider having the EGR or the catalytic converter replaced depending on what portion of the test fails. If the NO fails I would consider the EGR. If the HC fails then I would consider the catalytic converter. Good luck with this.

Posted on Apr 05, 2011

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I have a 1991 toyota 4-runner at idle in park its at 1050-1100 rpm when i drive and come to a light it drops to 700-800 with a rough idle still have plenty of power just want the rough idle gone


This sounds like a vacuum leak. Possibly at the brake booster. There is a check valve on the vacuum booster. Check it by pulling it out and see if you can blow thru it both ways. Air should flow freely in one direction and NO air passing thru the other way.

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1990 toyota camry 4 cyl fails HC part of CA smog test in idle. Also idle varies by 200-300 rpm and when driving the power really surges close to 3600 rpm. Could it be an O2 sensor?


try using 93 octane with some octane boost. get the good octane boost that cost about 7 or 8 dollars. Fill her up .drive her for about 200 miles so the octane boost can clean

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High hc


you may need replace the catalytic converter, but 1st do this, clean the throttle body and idle airbypass valve, change the oil before the retest as well, get it as hot as you can before the test, hold it at a high idle prior to the test, this may squeak you by, as a 20 year smog tech these are the thing I did, if all else fails do the cat conv.

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