Question about Datsun Stanza

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Datsun stanza 1800

Idle speed dropped after engine wash and now no power even after picking up idle speed to compensate.

Posted by imod05 on

  • Hoosain Louw Aug 13, 2008

    Idle speed too high and needs to be adjust all the time ?

    Why is it doing that ?

    What can be wrong with timing ?

    Can it be the timing -chain ?



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Check ignition coil, they are known to short circuit after a wash.
Try starting engine at night or in the dark and look around coil and leads for hi voltage sparks.

Posted on Aug 08, 2008


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1 Answer

When i turn on my heat/air on defrost or auto my rpms go up... what could cause this

The basic concept is that in auto or defrost the air conditioner compressor is activated.
The compressor when activated via an electrical clutch adds an additional load that will reduce the engine RPM. The the RPM is increased slightly when the A/C is activated to prevent the engine from stalling. Power produced by the engine is increased by allowing more air and gas into the engine. When it is working perfectly the RPM will remain the same but the engine will produce the additional power to power the AC compressor.

Usually the bi-pass air valve is how the compensation for the additional power is accomplished.

Depending on your make year and model several methods to achieve the AC compensations have been used. In your specific case if the compressor is not working(no Air) and the compensation is open loop no engine control electronics I would expect a surge in RPM. With no additional load from the AC the additional air into the engine would increase the RPM.
26106712-qb20k32l4fvb2dr3l0mnapaf-4-0.jpg On older cars there is a solenoid that has an adjustment for idle speed when the solenoid is activated. See the image above.
Hope this helps?

Feb 24, 2016 | Cars & Trucks

1 Answer

My SUV is choking and it hesitates

which engine? 2L I4 or 2.5L V6?
chocking, it bogs full time.
total loss of power at all times? any speed, any hill, any gear.
is this a A/T or M/T car, the A/T can slip. easy
does the engine lack power, or does the tranny slip.
slipping is easy to discover, the RPM of the engine rise fast
but you go now where fast.
bogging can happen in many modes. (all or just 1: pick one)
all permutations
1: hot engine?
2: cold or both.?
3: wont race even in neutral, but idles ok. at 800 rpm.?
4: only with a fast right foot,called tip in throttle. but recovers.!
5: lost power at all driving loads, and worse on hills.?
6: all the above.?
in a real shop, i drive it and in a few minutes all the above is seen and vastly more, that is why online help is so bad, (me too)
no inputs. = wild guessing.....
heck i even notice things like?
dash volt meter dropping. below 14v at any time running.
CEL glowing or worse flashing (USA feature , OP never said)
old noises and vibration.
clutch slipping or A/T slipping.
Scan tool connected, and seeing pending codes, or any odd PID behaviors.
bad idle speed, idle speeds not controlled correctly.
and 100 more things, Ill stop here, it's a complex machine.

Nov 10, 2013 | 2003 Suzuki Grand Vitara

1 Answer

Y does my 97 honda accord exsalorat when park

most engines idle in park at around 900 rpm this drops slightly when a gear is selected as the motor comes under load. The idle speed sensor should compensate for this the same as it should compensate for when the load is removed . Check for fault code in idle speed sensor area

Jan 29, 2013 | 1997 Honda Accord

1 Answer

Toyota yaris doesnt pick up speed from stationary

slow pick up can be related to the fuel filter or pump and even the fuel regulator. if you are driving at a steady speed and you feel as though you keep having to add more throttle it can be one or all of these. and even some times the air filter is a bit blocked.
other related parts that can cause slow pick up are leaking exhaust gasses from the manifold. ie when engine is cold it runs fine no problems then when the engine is up to temperature you lose power as you need to pick up. timing can do the same thing when it cold the timing is right and when warm its slightly out this will make the fuel and spark mix out of sync will also flood the engine with more fuel and you should notice this on the spark plugs. it can also be a vacuum line leaking. if its a 1999 model you may have a vacuum leak small cracks in the rubbers on the intake feeds or on the other ends where they go to devices this would make changes to the engine fast idle or idle drop erratic revup. hope these are helpful for you.

Feb 01, 2018 | Toyota Yaris Cars & Trucks

1 Answer

Acceleration problems ,at hiway speeds, needing more speed car downshifts sputters misses then eventually snaps backto normal whats up?

Ok. I'll give you my best guess, although I am not a Dodge Stratus expert. Based upon your description of the problem, I am to assume that the vehicle has problems accelerating up to speed, but once there, cruises ok unless you are going uphill or need to accelerate quickly, then power falls off rapidly and acceleration returns very slowly. If that is accurate, I would suspect the EGR valve. This is because at ihighway cruising speeds the EGR valve is pretty much wide open, letting exhaust gases back into the intake. When you need to accelerate, pressing the accelerator results in intake vacuum drop. This is partially compensated for by closing the EGR valve. If the EGR fails to close or sticks partway open, the exhaust gases will lower intake vacuum even further, and rob engine power. This can also cause the onboard computer to force a downshift to the transmission, as vacuum sensors are used to determine engine loading and the need to reduce gearing. In addition, a partially open EGR valve can cause erratic idle as it affects static intake vacuum (EGR is normally closed at idle) and the onboard computer must continually compensate, resulting is unstable idling.

Dec 04, 2011 | Dodge Stratus Cars & Trucks

1 Answer

When the a/c is running, when you stop at an interesection the car stalls

That's usually caused be a low idle speed.
But the processor should increase the idle speed when the A/C is on.

Check the normal ,warmed up idle speed, then step on the brake pedal to see how much the idle drops with the stop light load. Then turn on the A/C to see how much the idle drops.

The processor should increase the idle speed to compensate for the increase in load on the engine.

Jul 22, 2011 | 1998 Mercury Sable

1 Answer

Shuts off when a/c,lights & radio are on like the alternater is bad but no engine code & batt & alt test fine

Hook up a volt meter and watch your voltage when sitting idle and at 2,000rpm while doing each of the following (separately). First turn on the lights, then AC with max fan speed, then wipers.

With a good alternator at idle, it should be around 14v. It should have minor drop with the lights and quickly get back to 14v, when the AC and wipers are turned on it may drop to 13.5v at the lowest.

With a bad alternator at idle, it will probably drop below 13.5v with just the lights, and below 12v with everything else.

At 1,800-2,000rpm there should be virtually no voltage drop more than 2-3secs for the ECU to compensate and command more power from the alternator as this is the peak operating RPM.

Jun 24, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

1989 Cadillac Sedan De Ville engine stalls when air is turned on...tries to take off when stopped at stoplight..sometimes dies while driving..

It sounds like the idle compensation circuit for the engine is dirty or faulty. Have your car checked at a shop. have them check the idle air motor for dirt or malfunction. It could be that it only needs to be cleaned or replaced.

The compensation circuit adjusts the idle/slow speed of the engine. The air conditioner puts a load on the engine and this circuit adjusts the engine speed to compensate. Also, when the car is cold this circuit adjusts the idle speed to prevent stalling and help the engine warm up faster. I hope this information helps you.

Aug 16, 2010 | 1989 Cadillac Sedan DeVille

1 Answer

Engine seems to lack power w/ ac on . now engine will stall

Check the RPM if it drops when you have the AC on while the car is not moving. If it does drop you may want to check on the idle compensator. Its job is to bring increase RPM to make up for the added load. You may also want to check on the idle if it is below the normal speed. The added load may decrease the speed and send you to stall. If they all check out OK, you may want to check out the compressor as well if it gives the engine too much load. This can be caused by a faulty compressor or too much freon, or the bearing may be bad (with the bearing, you will get to hear a screeching or whinning sound).

Jun 16, 2009 | 2004 Ford F150

1 Answer

Good idling speed

This all depends on when you are reading the rpms becaus ethe engine will run faster when you first start it to bring it up to operating temperature than it will drop down to about 700-800 when the engine is warm. i recommend letting your engine warm up, than read your tach and if it is still reading 1000 rpms than reduce it down to 700-800. your ECU will compensate for this when your engine is cold.

this could also be a possible bad Idle Air Control Valve because your engine speed should be regulated by the computer.

Mar 30, 2009 | 1998 Honda Civic

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