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Amedee
Amedee, Dodge Technician
Category: Dodge
Satisfied Customers: 24390
Experience:  ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
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Caravan: 05 CARAVAN W/ 3.3. VERY WAEK ON TAKE OFF.

Customer Question

HELLO 05 CARAVAN W/ 3.3. VERY WAEK ON TAKE OFF. AS IF CAT CLOGGED UP. TOOK EXHAUST LOOSE NO BETTER. REPLACED MAP, TPS & FUEL PUMP. NO REPAIR. DEALER BEFORE ME REPLACED CRANK & CAM SENSOR. NO CODES IN PCM. VISUAL INSPECTION OF FLEXPLATE. NO VISIBLE CRACKS. SUSPECT TIMING ISSUE NOT FUEL. NO SPARK KNOCK HEARD. INSPECTED INJECTOR FILTER TIPS FOR TRASH OR SUGAR. CLEAN. ONLY 100K NO TIMING CHAIN NOISE. VERY DOUBTFUL TIMING JUMPED.
Submitted: 1 year ago.
Category: Dodge
Expert:  Amedee replied 1 year ago.
Hello and welcome!
My name isCustomerand I can assist you with your question.
What is the engine vacuum at with the engine at idle? What about at 2500 rpm?
Are there any codes in the computer?
Do you have access to a scanner that can read live data?
Customer
Customer: replied 1 year ago.
no codes. @ 17" at idle. did not check at 2500. map readings are correct with my autel scanner. also in spec with my snap on modis.
Customer: replied 1 year ago.
did you read my initial complaint
Expert:  Amedee replied 1 year ago.
Thank you for that information.
What are the fuel trims at under a load?
What is the ignition timing at according to your scanner?
What is the fuel pressure at under a load?
Customer: replied 1 year ago.
I did check timing under load while driving. appeared normal. did not write down. timing goes up with rpm. retards under load. compared to other car on lot. very simular. did not check fuel pressure. no dodge inline adapter. new fuel pump installed allready at customer request. no change in performance. have you seen this problem before on the 3.3. Is it common for the crank or cam pick ups to be off slightly without giving a corelatoin code?
Expert:  Amedee replied 1 year ago.
Usually the computer will set a code for the cam or crank sensor (or a correlation code) if this were the case even way before you notice a performance issue with the vehicle.
Customer: replied 1 year ago.
yes but this piece of crap will not get out of its own way. no pending codes either. no belt noise, as if an pulley or acessorry locking up.
Expert:  Amedee replied 1 year ago.
Thats because this problem is not related to the ignition system.
It is going to be something else.
Customer: replied 1 year ago.
have these vehicles had pcm problems? all data showed no tsb related to this problem. have you seen this problem before? just had a chevy in shop drove exact same. took exhaust loose repaired problem.
Expert:  Amedee replied 1 year ago.
YES, PCM do have problems. But this problem is not caused by a bad PCM.
YES, I have seen this many times before. There is not just "one" fix.
You need to diagnose the problem and I will help you but you need to listen and run these tests.
Do this as your first step and let me know..
Under wide open throttle watch the front oxygen sensor signals. I need you to get a voltage reading from both front oxygen sensors under a load. This is very important.
I also need you to check engine vacuum at 2500 rpm.
Based on what your telling me, the engine vacuum at idle is WAY TOO LOW.
Lets start by running these tests.
Let me know the results so we can continue.
Thank you
Customer
Customer: replied 1 year ago.
i will recheck every thing in the am. are you familiar with this engine? The exhaust wraps around front to back then is read by only one 02 sensor prior to cat o2 sensor. Low engine vaccuum would point to restricted exhaust. removed exhaust directly past front O2 sensor before cat. no change
Customer: replied 1 year ago.
Can you give me some fixes so I can sleep on. It is 1130 pm where I am at. been working on several cars all day. please give me a couple of senerios that you as a seasoned tech has run across. thank you
Customer: replied 1 year ago.
i appreciate the help. you cannot talk over my head. I was foreman at dealership for years. The pcm takes care of exacts referring to parameters. you have to remember no codes, pending either. i has to something basic that I am overlooking. All my dealership friend work on japanese products.
Customer: replied 1 year ago.
(It has to be something basic.) Poor spelling, getting tired.
Customer: replied 1 year ago.
are you done. can I talk to some one else please.
Expert:  Amedee replied 1 year ago.
Hello!
No I am not done. We are just getting started. However I am going to get some sleep.
You need to run these tests so we can continue.
There are too many things it could be. If I send over an answer now, you won't be happy with it and you will give me a negative rating and then you will process a refund. I have been down this road too many times before.
I would also like talk to you on the phone about this issue. Maybe we can talk tomorrow??
Customer
Expert:  Amedee replied 1 year ago.
Good morning!
Here is another test we need to do. This will help us pinpoint the root cause. This will tell us if the problem is ignition, fuel or engine mechanical.
Please run this test and let me know the results.
Under safe road conditions, a wide open throttle acceleration is performed. Try to maintain WOT for at least 5 seconds. 10 to 20 seconds would be better.
What will the pre cat oxygen sensor do?
Will indicate rich
Should the barometric pid change?
Should remain stable! Very important!
What will air flow do?
Max out. Volumetric efficiency. Engine load 100%
(Engine load Parameter on scan tool should go close to 100%)
Results
Poor acceleration, rich exhaust, and good Barometric pressure = restricted exhaust or late ignition timing.
Poor acceleration, rich exhaust, low or decreasing Barometric pressure = intake path restricted
Poor acceleration lean exhaust and good barometric pressure = fuel delivery concern.
Poor acceleration, lean exhaust and low barometric pressure = air flow measurement error.
Note: Some vehicles Barometric pressure is not updated until Wide open throttle.
Customer
Expert:  Amedee replied 1 year ago.
John,
ItsCustomerfrom just answer. Just checking to see how things are going and to see if you need any further assistance?
Customer
Expert:  Amedee replied 1 year ago.
Hello!
It'sCustomerfrom just answer. I am just checking in to see how things are going and to see if you need any further assistance?
Let me know!
Customer