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WHEN I START THE CAR, RPM GOES UP AND ONLY DROPS LITTLE, BASICALY RUNNING HIGH RPM, I ALREADY CHANGED THROTLE BODY W/POSITION SENSOR, AIR FLOW METER AND NO CHANGE..WHAT COULD BE THE PROBLEM?

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IAC - Idle Air Control- make sure you disconnect the battery while you change electrical components.

Posted on Mar 11, 2011

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2005 Dodge Ram 1500 4.7 Engine. Starts fine, Idles fine, but when engine shifts into high gear and RPM lowers engine runs really rough under load


Have you checked for a broken valve spring. Repaired a dodge engine with the same running issue as you have described and it was a broken intake valve spring.

Feb 22, 2015 | 2005 Dodge Ram 1500

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Engine runs rough and stalls sets a p0068 code on a 05 dodge durango


P0068-MAMFQLD PRESSURE/THROTTLE POSITION CORRELATION
' Image
Theory of Operation
This DTC sets when an unexpected high intake manifold air flow condition exists that
can lead to increased engine speed and puts the NGC into a High Air flow Protection
limiting mode. The High Air flow Protection feature includes RPM limits for when a
Throttle and or MAP sensor limp-in fault is present.
When Monitored
During all drive modes.
Set Condition
If vacuum drops below 1.5Hg with engine RPM greater than 2000 RPM and closed
throttle. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
-VACUUM LEAK
-RESISTANCE IN THE (FS56) 5-VOLT SUPPLY CIRCUIT
-(FS56) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
-RESISTANCE IN THE (Kl) MAP SIGNAL CIRCUIT
-(Kl) MAP SIGNAL CIRCUIT SHORTED TO GROUND
-RESISTANCE IN THE (FS55) 5-VOLT SUPPLY CIRCUIT
-(FS55) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
-RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT
-(K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND
-RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
-MAP SENSOR
-THROTTLE POSITION SENSOR
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Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
25312083-mkm0xbqveb5zta3uncrswycs-5-0.png Auto Repair Help US 25312083-mkm0xbqveb5zta3uncrswycs-5-2.jpg

Dec 07, 2014 | Dodge Cars & Trucks

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High idle rpm + hyundai santro


run the fault codes before you waste any more money as there are several sensors that will cause high idle.

Jul 17, 2013 | Cars & Trucks

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89 cutlass cierra crank but wont start when wet out unless gas pedal is pushed


This should be a drive by wire vehicle meaning it has a cable for the throttle body. First thing would be to see if any error codes can be pulled up (most parts stores will do that for free.) Drive by wire versus the late model that use electronic control for the idle have a IAC or idle air control which when first started controls the idle air intake--all air is run by it to idle the vehicle when cold--

Usual symptoms are rather high idle when cold engine or even idle and RPM jumping up and down and stalling when cold.

Another way if idle does drop when cold is tapping the gas--engine will still run until hot. Means not usually a fuel pump issue.

You could also have if the vehicle is fuel injected a dirty Mass air flow sensor, a throttle position sensor, etc.

These can be if the vehicle has them cleaned using a special zero residue spray cleaner.

First have it scanned to see what if any errors it shows--the computer.

Dec 17, 2012 | 1989 Oldsmobile Cutlass Ciera

1 Answer

Car dies when running and wont start again, i spay starting fluid in the throtle and it starts but if i let go of the gas it dies again and i can't start it normaly, fuel pump about 4 months old, new fuel...


Sounds like throttle position sensor to me. It will let engine go dead instead of maintaining an idle rpm. Try disconnecting battery,and after leaving disconnected for a couple of minutes,crank vehicle and maintain a steady rpm with gas pedal. Doesn't have to be revved up high just steady. Called relearning tps. Sensor might be bad but I would try this before buying a part first.

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1 Answer

My 1986 Ford F-150 5.0 EFI runs good, but when I start it it revs to 1700 rpm untill I give it a little gas then it drops to normal rpm. How do I stop it from the high revs when started?


Does it rev high when started cold or hot? If it does it either hot or cold, check the throttle position sensor on throttle body. If that is not bad, then check the automatic choke sensor.

Jul 03, 2010 | 1986 Ford F150 SuperCab

1 Answer

02 grand cher. 55000 miles. 4.0 engine. intermiten problem. on start up RPM's go to 2000. stays there briefly, drops to 1500 briefly, then slowly drops to 1000, late goes to 800 to 900. jeep dealer...


buffalo man said engine doing what it should do. friendly neighborhood mechanic said it go 1250 RPM on start up, then drop to 700 to 800
found defective part outside throttle body. runs OK now

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2 Answers

Air flow meter sensor.


the air flow meter adjust the mixture ( fuel /Air) to the intake . as the engine RPM increase if there is a irregularity when the throtle is increased then yes that would solve the problem . make sure first there are no vacume leaks this will make the same effect.

Aug 29, 2009 | 2002 Lincoln LS

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Here is the problem when i start my car 1999 vw passat 2.8 v6 the check engine light turns on then when i try to asselerate the engine, it goes up to 1500 rpm and 2000 rpm it goes up and down, then if i...


I researched this & you need to replace the throttle body gasket & get the throttle body re-calibrated. Seems to be dealer only. Also, the t.p.s. (throttle position sensor) could be bad.

Jun 23, 2009 | 1999 Volkswagen Passat

2 Answers

96 Mercury Villager stalls upon deceleration.


suspect distributer needs replacing. common to find brown dust from bearing going.

go here

http://autos.groups.yahoo.com/group/villagerquest/

Mar 27, 2009 | 1996 Mercury Villager

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