Question about 1997 Dodge Dakota

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2000 dakota 4.7 v-8 codes p0300 p0303 p0304 p0307

Loss of power won't go over 3000 rpm in P R N D. changed plugs, air filter, fuel press good, no intake manifold leak, does have exaust manifold leak, just had trans. replaced. ran fine for about 3-4 days. did have p0308 that went away.

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Well the codes
p0300 multiple misfire
p0303 misfire cylinder 3
p0304 misfire cylinder 4
p0307 misfire cylinder 7

can be alot of things check cylinders for compression is what i would do first..

Posted on Feb 20, 2009

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How do I fix a vacum leak on 2002 nissam sentra gxe


You have to find the leak and seal it up, hey. It may help to picture where vacuum originates in the engine: As the pistons move down in the cylinders they pull air in from the intake manifold. This creates a pressure drop in the intake, a vacuum that is maintained as the engine is running. New air that is pulled into the intake is measured by the Mass Air Flow sensor mounted in the big boot between the air filter and the intake. If extra air is pulled into the intake manifold from a vacuum leak, uncalibrated air, the computer can figure it out from the oxygen sensors reading in the exhaust-mixture is too lean, so the computer will try to compensate by delivering more fuel, but can't deliver enough, mix is still too lean, so computer sets a code for the vacuum leak.
The intake will have a few vacuum taps with hoses running to engine or car controls that require vacuum to operate. If one of the hoses comes off or has a leak, that is extra air into the intake. Your power brake booster has a large vacuum tap. That may be the problem. With the engine running, pull off that line and plug it, and see if engine speed changes. If the idle drops that may be your leak-a failed power brake booster.
If nothing yet, keep engine running and spray some starting fluid around the mounting area of the intake manifold (maybe the intake gasket has failed and sprung a leak) and listen for a change in engine pitch or speed. The fluid may get sucked into the intake and cause speed to change. If it does, you would need to remove the intake manifold and fit a new manifold gasket.
Also check the big boot from the air filter to the throttle body for tears or loose fit. Good luck, Rev!

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1 Answer

03 Monte Carlo no power


You have a vacum leak. It is going to be ya intake manifold. Best way to check it is to use some starting fluid and start the car and spray a very little around the intake. If the motors rpm goes up you know you have a bad intake gasket. If it doesnt then look for a vacum leak in the rear of your motor. There is about 4 vacum hoses there and one could be dryed out from the fire.

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1 Answer

My car has no power going up hills. Once you get going its okay,but when you come to a stop,at a red light or something it stalls out. Theres a puttering noice coming out the exaust. I changed my...


SOUND LIKE STOPPED UP AIR FILTER,FUEL FILTER STOPPED UP.CHANGE FUEL FILTER AND AIR FILTER CLEAN FUEL INJECTORS.YOU COULD HAVE BAD GAS. IF ALL IS GOOD.YOU COULD HAVE STOPPED UP EXHAUST SYSTEM LIKE PLUGGED MUFFLER OR STOPPED CATALYTIC CONVERTER HAVE MUFFLER SHOP TO CHECK EXHAUST SYSTEM OR YOU COULD HOOK UP A VACUUM GAUGE TO THE INTAKE MANIFOLD VACUUM HOSE.IF VACUUM SLOWLY DROPS FROM 18 TO 0 HGS WHILE ENGINE IDLING YOU HAVE PLUGGED EXHAUST SYSTEM. CODE SCAN FOR FAULT IN THE TCC SOLENOID ITS WILL CAUSE STALLING PROBLEMS AT A STOP ALSO.

May 06, 2011 | 1999 Pontiac Grand Am GT

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When the vehicle is placed in gear the rpm's drop low and it almost stalls. if i press the gas the rpm's drop even lower, if i hold the gas slightly at this ponit it will slowly begin to go and starts to...


sounds like an intake manifold gasket leak which will throw of the air fuel mixture and engine cannot account for extra air.also check(maf)(map)(tps)sensors and/or (iac)intake air control valve...hope this helps you. thanks for using fix ya please rate answer.

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1998 chevy vortec v8 stops accelerating at 3000 rpm when engine at operating temp. problem is worse in warm weather. it will accelerate below 1/4 throttle then when you get in the throttle it just stops....


Have you checked all your vacuum lines. One may have rotted and has a hole sucking in more air then needed messing up the air fuel mixture. Take a can of carburetor cleaner and while the engine is running spray short bursts around the carb and theintake manifold and where any little black hose lines are hooked up.If the engine revs up in rpms then it has an intake leak sucking in air where its not supose too.
This will cause power loss. Also check your air filter to make sure it is not plugged up. Ihope this helps, The Raz

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I have ford explorer sport 4.0l mis fires @3000 rpm changed spark plugs wires idles under a grand is it plugged injectors??


intake manifold gasket leaks are a problem.spray carb cleaner around the intake and if the rpm jumps when sprayed,the gasket leaks

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91 S10 rough idle, stalling ALDL problems


Make sure there is no vacuum leaks.


Vacuum leak at intake manifold and vacuum hose.

Bad Idle Air Control Motor (IAC)

Low compression (170 psi + is OK)

Start cleaning and repair these trouble spots and see is there any improvement.

====

For more advance DIY'er then you may try this.

Use a can of Berryman carburetor clean to locate the vacuum leak.


SEE SAMPLE PICTURE HERE


This is a 20-30 minutes job.

Vacuum leaks can occur in following locations.


Intake manifold AND/OR vacuum lines.


Intake manifold is not accessible unless the engine head if off.

You can still check the potential leak by spraying some Berryman near the intake manifold.

Listen for rpm increase after you introduce the Berryman (FUEL) at idle.


Do the same starting from the brake booster unit (the round unit) on the drive side fire all.

Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.

Get a friend to HEAR the RPM increase or monitor for RPM on the tech.

DO NOT AIM the Berryman into any heat source.


PLEASE RATE my answer if it is useful to you.

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When were plugs & wires last replaced?

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if you have a vacuum guage handy hook it to your manifold and if your reading is under 15 hg then you have a manifold gasket leaking or you could just replace the gasket.

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