Question about 1991 Toyota Pickup

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1991 toyota i have a 1991 toyota pickup when warmed up idles high then when you put your foot on the break the idle goess up and down replaced brake light switch didn't help now what should i look for.

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Turn the idle screw clockwise on top of throttle body. This will lower the idle and get rid of your up & down idle when you depress the brake.

Posted on Feb 05, 2010

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I suspect what you have is a vacuum leak.

1. Try hunting down the leak with carb spray. Don't get too crazy with it, when you get to your leak it will change the way it runs. Also do not deliberatly spray this on spark plug wires as one stray spark and you will need a fire extinguisher. This method is safe, just use your head.

2. If you detect a leak at the brake booster, unplug the vacuum source line for it and plug it. Then trying running the truck again. If it runs normal the leak is in your booster and must be replaced.

Posted on Feb 03, 2010

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1 Answer

Idle Rpm Too High.


A high idle is caused by either a massive vacuum leak or a sticking idle speed control valve. I would think you have a vacuum leak, use a can of carb spray and shot around the top[ of the engine, if you hit a leak the engine will sound different, repair as needed.

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When Brake is applied the Idle tends to drop on my 1995 toyota pickup EFI 22R engine


this is absolutely normal with a well maintained broken in engine. the engine is at rest when stopped,so the ecm lowers idle till you drive,which puts the engine under load.if it causes the engine to stumble or die,then replace air filter and set up the idle.

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91 toyota pickup 4cl idles rough when warm when brake is pressed


HI, i would advise to check the following areas for faults. replace any part that is fouled or malfunctioning.

1. Check the air filter- This device may be clogged or dirty. replace if visibly fouled.
2. Check the fuel pressure regulator- pull the vacuum hose of the regulator. if there is gas in it, replace the fuel pressure regulator.(if there is no fuel present in the lines, move on to the next check point)
3. Replace the fuel filter and, check the voltage at th fuel pump. you should get 12V at the pump. if its lower than twelve, chekc the ground for corrosion as well as the entire wiring harness as well. all the way to the relay for fualts.
4. Check the Intake Manifold Gasket for worn or damged edges. this ware and tare will cuase leakge. replace this gasket if found to be fouled in any way.
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Jul 19, 2009 | 1991 Toyota Pickup

1 Answer

1994 toyota pickup idling problems


Could be a throttle position sensor going bad or a loose or leaking vacumm line or loose or worn wiring harness. You had mentioned the engine starts heating up. Do you mean overheating or operating above normal temperature? Sounds like a vacumm issue with the fluctuating idle. Check for worn vacumm lines and check to see if the vacumm is functioning. Sometimes a simple vacumm line with a loose connection or a small hole in it can affect your idle. Old lines are easily replaceable and an inexpensive place to start, then try your egr valve, pcv valve, brake booster vacumm line, oxygen sensor could be worn and affecting the mapping of fuel and air on the computer. Usually the check engine light will come on in this case.

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Take car for trouble code at Autozone or similar store for free. it is probably the idle position sensor.(IPS)

Feb 19, 2009 | 1991 Toyota Pickup

2 Answers

Idle surges after warm up and when brake pedal is pressed


1990 22re same problem surge when pedal was depressed thought it was booster or check valve still didnt fix it i even put a brand new booster on it just to make sure still no fix it finnally went away on its own for about a month now it does it just sitting at an idle with out the brake pedal depressed traced all vaccum lines no problem there and still have no clue

Jan 19, 2009 | 1991 Toyota Pickup

2 Answers

89 Toyota pickup erratic idle when warmed up


its a vacumm guys check all your hoses with a carb cleaner while engine on be carefull not to let it catch on fire with the spray ok give it a slight of puff of it with the spray ok!! remember truck hoses are old and cracking ..

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