Reaches Idle Then dies. like clockwork

1370 Views 11 Replies 7 Participants Last post by crawler93, Aug 25, 2004

Joe_wilson

Discussion Starter · Aug 18, 2004

Hey guys I was wondering if anyone could help me out. I’ll keep it short.

Symptoms.
1. Truck will crank and reaches idle RPM for 4 sec. RPMs begin to fall 2sec later it dies.
2. Truck cranks and reaches Idle RPM If I touch the gas at all (to try and rev it) It dies Instantally.
3. If I hold the key in the “crank” position and rev the engine it’ll rev good. (I know not goof for the starter)
4. It will crank every time and die every time exactly the same.
:hammer:

Thanks in advance guys.

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chronoti

· #2 · Aug 18, 2004

3. not good for the starter.

sounds a little like a fuel pump or filter problem. also could be the ignition coil. also could you tell us what engine and year so we can offer you more precise advice?

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Joe_wilson

Discussion Starter · #3 · Aug 18, 2004

Sorry it's a 1991 22-RE Toyota truck.

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Joe_wilson

Discussion Starter · #4 · Aug 19, 2004

Ok Guys I replaced the Fuel filter :headbang: (WTF Were they thinking) And the PCV Valve. That fixed the problem where it dies after it reached idle speeds. but I now have a new problem, or a slightly better old problem.

22-re, EFI, 180,000mi

1. The truck will crank every time. But it has extremely rough idle. I 'm talking about not being able to drive it’s so bad. She'll crank then Idle at about 1000rpm (where I had the Idle set to). But after a min the idle will drop down to like 100rpm and start to sputter barely staying alive. If i tap the gas it might rev or it might die. Usually dies.

2. If she is idling at 1000rpm and I push the gas she might rev or die. If she revs I'll try to hold her at 3000rpm or wherever I can. But then with my foot in the same position on the throttle the rpm will start to drop until she is sputtering. While it's sputtering (100rpm) i can floor it and it'll still maintain 100rpm.

3. Basically I have a very rough Idle and no throttle response.

POPSSIABLE FIXES

1. Throttle Position sensor. (What are the symptoms of a bad one?)

2. ECU

Thanks guys.

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thespud

· #5 · Aug 19, 2004

or possibly your fuel pump and or regulator is the problem now... it does sound like a fuel problem tho..

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JPerez

· #6 · Aug 19, 2004

I'd say there is a reason the fuel filter was plugged in the first place. Chances are good that after 180,000 miles worth of gasoline, there's some sludge in your tank that is affecting the fuel pump.

I had a very similar problem with a GMC Jimmy of comperable age and mileage. The vehicle would start and idle fine, but it wouldn't make power. As RPM increased it leaned out badly and died. It was as if the fuel pump could provide only enough flow to maintain good pressure at idle.

Turned out to be a tankful of sludge which had clogged the fuel pump. Replaced the pump and filter, and cleaned out the tank very thoroughly, and it ran like a champ.

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Joe_wilson

Discussion Starter · #7 · Aug 19, 2004

JPerez said:
I'd say there is a reason the fuel filter was plugged in the first place. Chances are good that after 180,000 miles worth of gasoline, there's some sludge in your tank that is affecting the fuel pump.

I had a very similar problem with a GMC Jimmy of comperable age and mileage. The vehicle would start and idle fine, but it wouldn't make power. As RPM increased it leaned out badly and died. It was as if the fuel pump could provide only enough flow to maintain good pressure at idle.

Turned out to be a tankful of sludge which had clogged the fuel pump. Replaced the pump and filter, and cleaned out the tank very thoroughly, and it ran like a champ.

Is there anyway that I can test the pressure from the fuel pump?

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JPerez

· #8 · Aug 19, 2004

Shouldn't be too difficult if you have the right tools (a fuel pressure gauge and the right adapters)

You should be able to procure a cheap vacuum / fuel pressure gauge at an auto parts store. You'll want to place it somewhere such that it is exposed to the pressure on the fuel rail (between the filter and the regulator) which is what the injectors themselves are seeing. I'm not familiar with the 22-RE, but some fuel systems actually have a port you can plug into, others require the removal of the cold start injector pipe or some other easily accessable fitting.

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yoder-bug

· #9 · Aug 21, 2004

also might check int the idle air control valve, if it will run when u hit the gas but wants to die at an idle the could be a part of the problem

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chronoti

· #10 · Aug 21, 2004

eh also while your at it check the egr valve ... too much exaust gas would kill the engine.

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coronet

· #11 · Aug 24, 2004

I had a similiar problem with my 1987 pickup w a 22r.

There is a small computer that switches on after the engine turns over, this computer controls the idle, if the contacts on it are corroded then it will cause a rough idle or die the moment after it turns over....once the feul in the carb is spent it dies.

Cleaning the contacts fixed my truck right up!

A new feul pump wouldnt hurt either.

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crawler93

· #12 · Aug 25, 2004

before you dig into the computer try the intake..Check every hose everyfitting make sure shes all snug and try it. If it still happens maybe switch intake hoses with someone and try it. That happens alot wheelin. your engine can shift so much when Rockcrawlin that you intake hose will come off. So try that before the computer ideas. Computer is always bad news.

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