Misfire on the 1 and 3 cylinder ,already changed the plugs wires and coil what could it be
Gas or compression. Check the injector circuit on 1 and 3. Are they pulsing, to put gas in the cylinders? Do a compression test to rule out loss of compression as cause for the misfire.
Kind of odd it would be 1 and 3, but that is one right after the other in the firing order of 1-3-4-2...so, you have a single coil? So you have a distributor-examine closely the distributor cap and rotor if those were not changed too, with the plugs and wires. Look for damage, little black tracks that indicate shorting of the spark, maybe damage at the electrode tips on the inside of cap on 1 and 3 plug wire towers. Most people change the cap and rotor when doing the plugs and plug wires.
Just a possibility also, that the injector ground wires for 1 and 3 might share the same ground. That is to say, they might splice together before going to the computer where the computer internally grounds injector circuits to cause pulsing. Well, those are my thoughts, good luck. And let me know what you find, always interested.
SOURCE: No Start, No Spark, for Grand Caravan 3.8L
we get remans bad out of the box......... good luck
SOURCE: Recurring #2 cylinder misfire.
Hello Mr Fixit...If memory serves me right, the PO352 B fault code would indicate #4 cylinder coil and PO352 A for #3. The
Possible causes ...faulty spark plug...faulty spark plug wire..faulty ignition coil pack..faulty PCM...open or short in wiring from PCM to iginition coil pack. To accurately troubleshoot and determine the problem you will need an oscilliscope and a diagnostic scanner. Without these you are basically guessing as to the cause.
The ignition control module is integrated into the PCM and a faulty ICM can definitely cause this trouble code...and i have seen my share of faulty PCM's.
Hope this helps and the best of luck to ya.
SOURCE: idle is rough in gear at stop 98 caravan 3.3L
I HAVE A 96 DODGE CARAVAN WITH A 3.8L ENGINE..I HAD SIMILAR PROBLEM AND IT WAS THE UPPER INTAKE PLENUM GASKET HAD PIECE MISSING OUT OF IT..MISSING ON #5 CYLINDER AS WELL..GASKET WAS ONLY ABOUT 10 BUCKS AND I REPLACED IT IN ABOUT 30 MINUTES..TOOK ALL BOLTS OUT OF MANIFOLD AND JUST LIFTED IT UP HIGH ENOUGH TO GET OLD GASKET OUT..MIND YOU..I'M AN EXPERIENCED CHRYSLER TECH AND DO A LOT OF ENGINE WORK..SQUIRT SOME BRAKE CLEANER AROUND UPPER INTAKE AND SEE IF ENGINE SMOOTHES OUT..LET ME KNOW WHAT HAPPENS
SOURCE: MIL indicates cylinder misfire on 1, 3, and 5
Check for
vacuum leaks on intake manifold,
the air tube between the air filter.
intake manifold vacuum hose.
===
clean throttle plate with Berryman carburator cleaner
SEE sample picture HERE
===
Also remove carbon built up behind the EGR valve and the EGR passage tube.
===
Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.
More un-metered air (leaks) will lean out the fuel mixture.
Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.
At idle,just spray and listen for the RPM surge.
The in-rush of carb clearer will increase the RPM on the motor.
Record the problem spot(s) and address it later.
===
EGR carbon built up require 2+ hours to clean from start to finish.
You will need a new EGR base gasket before your start.
Locate and remove the EGR valve after the vehicle is cool down.
Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.
Remove the EGR valve.
Inspect the location of the carbon built-up inside the valve and the EGR passage tube.
SOAK these areas with WD-40 spary.
You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.
RE-SOAK the carbon and let it sit for over-night will also help.
One the last round,pass a shop vacuum of the EGR valve and the passage pipe.
Install the new EGR gasket and connectors.
Allow the vehicle to warm up outdoor to burn up any remaining WD-40.
Take it for a test drive.
Please rate my answer if it's useful to you.
Cheers,
Mustgo
SOURCE: 99 dodge caravan #4 cylinder misfires, i replaced
This is a known dodge issue replce the injector!!!!! done deal
399 views
Usually answered in minutes!
×