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V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters
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Old 02-06-2013, 12:13 PM   #11
a1 technician
 
Join Date: Feb 2013
Vehicle: 2000 ford mustang
Location: california
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Default Problem Solved

Quote:
Originally Posted by jdwestsr View Post
Sorry for the long post, but I want to give as much detail and history as I can.

Here are the particulars:
2000 Mustang with 3.8l engine and automatic transmission.
Around 148,000 miles
Most recently driven by inattentive college age daughter.

First noticed excessive vibration that you could feel in the steering wheel and hear in the dash and interior trim. Also noticed significant drop in gas mileage. No check engine light.

First mechanic said engine diagnostics were good, vibration caused by bad torque converter. Replaced torque converter -> Did not fix the problem.

Next mechanic found misfire on one cylinder. Replaced plugs, replaced one injector, cleaned other injectors -> Did not fix the problem. Parked the car for several months.

Next mechanic found a couple of plug wires that showed heat damage and were arcing, causing intermittent misfires. Also discovered it had a blown head gasket. (I'm pretty sure this happened when I drove it once during the time it was stored. It wasn't a problem when the earlier mechanics looked at it.) I had the heads checked & milled, replaced the head gaskets, plugs, plug wires, oil & filter. -> DID NOT FIX THE PROBLEM.

Very frustrated now. It is not mis-firing, exhaust tune sounds right, and there is no loss of power. However, the vibration is still there. My mechanic believes the engine is 'out of balance' and suggests that it could be either the internal balance shaft & chain, or possibly we could have thrown a balance weight on the crankshaft (I didn't know these engines had weights on the crankshaft - is this true?). In hindsight we should have gone ahead and torn down the entire engine when we had the heads off so we could eliminate all possibilities. The car is put back together now and it seems to run fine except for the vibration that will not go away. I suppose we could just drive it till it fails, then either rebuild the motor or replace it with one from the junk yard.

Any suggestions from the experts here? Is there something unique to this engine that we are overlooking ? Or something obvious we haven't considered? I've spent too much on it already considering the value of the vehicle. However, I really don't like the idea of problem that can't be diagnosed and solved.
I know exactly what your experiencing. Im a shop owner here in Los Angeles and have been trying to resolve the same problem for 3 days. I repaired the same problem by going to the dealer and purchasing a New harmonic Balance. Also there are 2 different ones that the vehicle cars for. I put on one and the same problem still was there, so I went back to the dealer and found that the vehicle had another option for thAT make and model. Part number is XR3Z-6B321-AA. Also the vehicle had a misfire on cylinder no.1 which wasnt coming up on diagnostic trouble codes. Be sure to have vehicle checked for a misfire, as replacing the balancer will only eleviate one problem or concern of vibration. Hope this helps.
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Old 02-06-2013, 12:18 PM   #12
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Originally Posted by a1 technician View Post
I know exactly what your experiencing. Im a shop owner here in Los Angeles and have been trying to resolve the same problem for 3 days. I repaired the same problem by going to the dealer and purchasing a New harmonic Balance. Also there are 2 different ones that the vehicle cars for. I put on one and the same problem still was there, so I went back to the dealer and found that the vehicle had another option for thAT make and model. Part number is XR3Z-6B321-AA. Also the vehicle had a misfire on cylinder no.1 which wasnt coming up on diagnostic trouble codes. Be sure to have vehicle checked for a misfire, as replacing the balancer will only eleviate one problem or concern of vibration. Hope this helps.
Also the vehicle is internally balanced also, it has a balance shaft inside of the timing cover right above the camshaft. Though its not common for it to go bad, just keep in mind that it is there on the 2000 Ford Mustang with a 3.8 liter Engine. This information comes with regards to an ASE certification in Advanced Engine Performance, Brakes, Electrical Systems, Engine Performance, and Steering / Suspension systems. Any other diagnostic questions or help needed. Look us up at VRF Auto Service. 11861 paramount Blvd. Downey,Ca 90241
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Old 02-06-2013, 01:18 PM   #13
Derf00
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Pic of 2000 3.8L two different balancers available that year. It was posted on a 3.7 board.

http://3.7mustang.com/vb/attachments...001-harbal.jpg

Original Thread:
http://3.7mustang.com/vb/f5/crankshaft-question-259144/
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if you are getting 29mpg in your 5.0, you aren't driving it correctly
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Old 07-24-2013, 01:44 PM   #14
Namiaz Namias
 
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Default vibration

im having the same issue with vibration, it does it in idle and while driving , less when going fast then vibrates hard when slowing down, ive been told flywheel , and harmonic balancer , can any one let me knw if this is the right things to replace, i get no eng codes
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Old 07-24-2013, 02:52 PM   #15
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Harmonic balancer or motor mount(s) still my guess. Any close on this, what was the problem?
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if you are getting 29mpg in your 5.0, you aren't driving it correctly
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Old 07-24-2013, 06:32 PM   #16
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It's almost always the harmonic balancer in situations like this.
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Old 12-18-2013, 07:50 AM   #17
MarkShasti
 
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guys you will not believe that but there was same problem with my car. i visit to many auto repair shops but it did not help me .but at last some one told me about Jay's Auto Service.and it is like magic they fix my problem in first attempt. so i told many people about them. if it is possible then you must visit there to diagnose your problem.they also offer a wide range of auto repair services including Tires change,breaks repair,shocks repair,alignment,suspension,ac service etc.
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Old 12-18-2013, 07:50 AM
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2000, 2001, 38l, bad, balancer, caused, cel, cobra, damge, engine, ford, harmonic, intermittent, misfire, mustang, vehicle, vibration

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