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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23001
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Have asked this questionbefore, but ca't get the car

Customer Question

Have asked this questionbefore , but ca't get the car fixed....Let's try again - different tech
Here we go...2001 ford focus SOHC
* At idle car runs for about 30 seconds, experenices a quick miss, runs for another 30 seconds and experiences another quick miss and continues ths pattern
* At idle car misses when turn on heater blower fan
* At battery alternator is putting in 16+ volts
*when remove hot wire from alternator to battery, volts at battery reguister 12 and car does not miss when turn on heater blower
* Hard to start...turns over way more than normal
* valves pinging when try to accelerate
Checked timing ...fine, replaced plugs,wires, distributor,fuel filter and pump
Could it be a bad PCM, Cat, Cam and/or Crank sensor
Submitted: 15 days ago.
Category: Ford
Expert:  david craig replied 15 days ago.

Hi First of all the alternator is putting out way to much voltage. it should be 14.4 and that is going to be the root of your problem.

Expert:  david craig replied 15 days ago.

what engine do you have?

Expert:  david craig replied 15 days ago.

straight from the service manual

Customer: replied 15 days ago.
2.0 SOCH
Customer: replied 15 days ago.
2.0 soch
Customer: replied 15 days ago.
David, are you gone for the day?
Expert:  david craig replied 15 days ago.

nope ill be with you all day

Customer: replied 15 days ago.
Do you have any suggestions on how to fix the car? My card has been charged and I have not received a response.
Expert:  david craig replied 15 days ago.

i gave you the answer in the attachment. replace the alternator

Customer: replied 15 days ago.
Alternator is fine
Customer: replied 15 days ago.
Someting is causing the alternator to overcharge...is it the PCM
Expert:  david craig replied 15 days ago.

standby

Expert:  david craig replied 15 days ago.

PCM control the voltage it has an internal regulator, so, if you have already remove the alternator and have had it bench tested and its tested fine then the PCM could be the problem yes.

Customer: replied 15 days ago.
What's involved in replacing the PCM or how do I go about correcting this problem? Can I get a PCM from another car?
Expert:  david craig replied 15 days ago.

you can get a pcm from another car as long as the part numbers are an exact match. then you will need to have it programmed to your vehicle. you also will need to get the immobilizer from the same car.

Expert:  david craig replied 13 days ago.

just checking in to see how its going