How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dr. Hamman Your Own Question
Dr. Hamman
Dr. Hamman, Automotive Engineer
Category: Car
Satisfied Customers: 6286
Experience:  30 years experience, Repairing, building, & designing, automobiles.
9795573
Type Your Car Question Here...
Dr. Hamman is online now
A new question is answered every 9 seconds

I have a 2002 Isuzu rodeo sport 3.2 4x4 I r/r the oil pump

This answer was rated:

I have a 2002 Isuzu rodeo sport 3.2 4x4 I r/r the oil pump assembly and timing belt the vehicle starts but it will not accelerate I have a code of 1312

Hi, I am a professional certified mechanic, with an engineering background, and 35+ years experience. I will do my best to assist you. Also keep in mind I don't know if you are a pro or a novice, so feel free to add any additional info at any time.



Code 1312 is deep, and not well understood. The 1312 code triggers when the ion sensing ignition module has problems, or has perceived problems. This setup is used on the Delphi "ion sensing" ignition system where the spark plugs are used as a sensor (when they are not firing) to measure the electrical resistance of the gasses in the combustion chamber. This allows the computer to know the ion content of the combustion chamber gasses, and fine tune the ignition, and fuel system. So that is the 1312 code.



As far as the wont accelerate, I have been around engines a lot, and the first thing that comes to mind is the possibility of the cam timing be off. Many times after work like this something happens to the cam timing, and the person who has worked on it is sure the timing cant possibly be the problem. Still even if you are sure, you need to check the cam timing again. A quick check is to do a compression test. If the cam timing is off, the compression will be low. That is where I would start, from there you will need to get into the electronic engine controls to solve the problem. Go over all of this and if you have any more questions at all, I am here to help. Good luck with it, have a great day, and Thanks for using Just Answer.


I do not get paid for my work unless you rate at 3 to 5 Smiley Faces or Stars, a bonus is always greatly appreciated. If the answer is not clear, let me know what additional help you need, and I will be happy to assist you further.


Dr. Hamman and 4 other Car Specialists are ready to help you
Customer: replied 4 years ago.
Thank you not home now but ill try this on Monday all call XXXXXXXXXX Orlando. Please give me a call if possible. Thanks again

Hi, I am a professional certified mechanic, with an engineering background, and 35+ years experience. I will do my best to assist you. Also keep in mind I don't know if you are a pro or a novice, so feel free to add any additional info at any time.



Hi, these can be tough to deal with. I would call you but it is against Just Answer rules for me to call any customers. Any time a phone number is XXXXX it is automatically removed, so numbers don’t come through. We have to work within this forum here, I know that is limiting, but a lot can be done this way. Anyway, check it out, and let me know if you need any more assistance. Good luck with it, have a great day, and Thanks for using Just Answer.


I do not get paid for my work unless you rate at 3 to 5 Smiley Faces or Stars, a bonus is always greatly appreciated. If the answer is not clear, let me know what additional help you need, and I will be happy to assist you further.