On the highway you have air flow threw the raid on side roads no air speed is the fan turning on?
By Robert Koehler May 21, 2012
The engine temp is rock solid in the middle of the gauge, engine not over heating, I had once read that the Cam Positioning Sensor starts to go with age, I was thinking that with the heat buildup because of the flow under the hood was less than on the highway that the heat was affecting the magnetic field of the sensor.
working on all makes i have seen more crankshaft sensors make the car cut off than cam sensors cam sensors going bad do more like rough running and power problems
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SOURCE: 1997 Mazda dies when warm - runs smooth when cool
possibly a bad module------cracked---or???? In any case you may get expansion as engine compartment warms up----module shuts you down. Sometimes really hard to diagnose and just putting in a new module is "spendy"----especially if it turns out not to solve the problem!
SOURCE: how to remove and inspect throttle body on 1992 mazda miata
Things that make your engine do what it is doing.
1. Vacuum leak
2. EGR valve
Find the vacuum leak if there is one.. and check the function of your EGR valve.
A functioning EGR valve with an ORAL vacuum line suction test will cause the engine to stall / die when suction is applied to the ORAL external line.
Even if it passes the ORAL test... it can still have carbon build inside the plumbing that does not allow the seating pin to fully seat and the engine will surge or be hard to start when warm.
So check / listen carefully for vacuum leaks and check the EGR valve.
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The engine temp is rock solid in the middle of the gauge, engine not over heating, I had once read that the Cam Positioning Sensor starts to go with age, I was thinking that with the heat buildup because of the flow under the hood was less than on the highway that the heat was affecting the magnetic field of the sensor.
cam and crank senors have no moving parts but can cut out with temp
Thanks Mike.
Thanks Mike, my background as an aircraft mechanic has helped in a lot of troubleshooting of other vehicles besides aircraft. I have seen Torque Pickups on turboshaft engines that have been effected by the heat and also the amount of iron found in the engine oil flowing between the pickup and the teeth on a torque shaft. Either having an effect on the sine waves generated by the twist of the shaft or the heat reducing the magnetic field. With the sensor being 10 years old and the generation of the heat buildup could be the cause of the sensor "cutting out" or giving false readings and sending it to the Crank Shaft Sensor and effectively causing the computer to shutdown the engine. I was wondering if you or anyone reading this thread might have had the same "problem/solution" thought process. New cam shaft sensor is on the way and wil post back in a couple of days to let you know if this fixes it. Thanks again for your help Mike, any other ideas will be gratefully accepted.
Thanks Mike, that'll be my next move. Hopefully this will fix it though. I hate spending money.... LOL.
Replaced the Cam Positioning Sensor, ran car for @ 1/2 hour in garage. Ran great. Will give it a road test this afternoon when my girlfriend with her support vehicle following. Thanks Mike.
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