Ask Your Car Question. Car Experts Answer You ASAP.

(Not a Car Question?)

I have a 1990 mazda B2600i 4x4 Strait Dr Truck, 113130 ...
Sent to Car Experts August 27 10:13 AM

I have a 1990 mazda B2600i 4x4 Strait Dr Truck, 113130 miles. It was running fine untill about 2 mounths ago on a trip. It would start missing badly and quit. If I keep the RPMs up it will keep running for a while but then quit. After a while it will crank up again. Sometimes if it won't start the tach doesn't move even though the engine is turning over fine. I checked the fuel pressure and replaced the fuel filter, replaced the distributer, coil and spark plugs and now cheaked the compression at arround 100lbs. It will start and run fine sometimes for several miles, but then, start missing and quits. Sometimes this happens much sooner. I don't know what to try next. I would apreciate any advice. Thankyou.

Edited by Customer (name blocked for privacy) on August 29 2006 at 3:15 PM

 

Optional Information:
1990 Mazda B2600i 2600i

Already Tried:
New coil, distributer, fuelfilter, checked fuelpresure.

Customer (name blocked for privacy)
Status:  Closed   Value: $8
Reply
August 29 3:22 PM (2 days and 5 hours later)
         
Relist: No answer yet.
Customer (name blocked for privacy)
Answer
August 29 4:59 PM (1 hour and 37 minutes and 27 seconds later)
         
ACCEPTEDCheck Mark

One of the most common problems is:
Powertrain Control Module (PCM) voltage regulator failing causing low or no reference voltage to the Coolant temperature sensor, intake air temperature sensor, throttle position sensor and atmospheric pressure sensor.
Voltage regulators can fail in the computer causing many different drivability or starting problems. Check the reference voltage on the coolant temperature sensor (CTS), intake air temperature sensor (IAT) and throttle position sensor (TPS). It should be 5v. If less, like around 2.5v, then the computer voltage regulator is faulty.

OTHER CAUSES COULD BE:

Grounds -
A loose engine control module (ECM) ground wire connection that is affected by road vibration can cause the engine to stall while driving.

Engine Control Module (ECM) -
An ECM that has lost the 5-volt reference supply to the sensors or has burnt spots on the circuit board can cause the engine to stall while driving.

Ignition Switch -
An ignition switch with worn contacts can cause a loss of voltage to the ignition system and cause the engine to stall while driving.

Igniter -
An igniter that fails intermittently will cause a loss of spark and can cause the engine to stall while driving.

Overlooked Causes

Engine Wire Harness -
An engine wire harness that has a poor connection or has a broken wire that is affected by road vibration can cause the engine to stall while driving.


Is the check engine light coming on?



Edited by enginboy on August 29 2006 at 5:01 PM
1 Other Expert Agrees with this!
PictureMarc -- Technician -- 98% Positive Feedback on 1029 Car Accepts
33 years exp. automotive repair NYS emisisions repair cert.
Think you can answer this question?
Login or Become an Expert

Related Answers

 

DISCLAIMER: You acknowledge that any information you may obtain from individuals you contact through use of the Just Answer service comes from those individuals, not from Just Answer!, and that Just Answer is not in any way responsible for any of the information these third parties may supply. The site and services are provided "as is" with no warranty and no representations are made regarding the qualification of an Expert. Responses and comments on Just Answer! are for general information and are not intended to substitute for informed professional advice (such as medical, legal, investment or accounting) and do not establish a professional-client relationship. Just Answer! is not intended or designed to address EMERGENCY QUESTIONS which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service.

Just Answer! > Car Repair