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Unread 08-17-2009   #1 (permalink)
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Default 1993 ford mustang gt cruise surge

good evening. does anyone know what would cause my car to surge at cruise? it does not have a problem at wide open throttle. the iddle is also low and very rough. thank you.
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Unread 08-17-2009   #2 (permalink)
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Dose the cruz kick out completely when this happens? If so you should check the TPS. If the TPS is going bad, it will make the cruz surge and kick out.
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Unread 08-17-2009   #3 (permalink)
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sory i wrote that wrong. its not the crurise control its just when you are barely on the throttle. but it runs fine when it is at wide open throttle.
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Unread 08-17-2009   #4 (permalink)
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Again check the TPS. If you have a digital volt meter you can do this yourself. You need to pierce the GREEN wire with a small probe (a small safety pin works great) and connect it to the positive lead on you meter. Then connect your negative lead to a good, close ground I.E. the EGR spacer. Next turn the car on but do not start the engine. Check your voltage reading, it should be around .98v. Then, with a free hand, slowly open up the throttle all the way. Your volt reading should be smooth as the #'s go up the scale. If they jump around in cretin spots then you need to replace the TPS.
Good Luck J.P.
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Unread 08-17-2009   #5 (permalink)
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thank you for the advice. i will try that tomarow and see if it works.
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Unread 08-18-2009   #6 (permalink)
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IF the CEL isnt on, no need to check the TPS. If it is on,then thats different. Most surging is timing related.
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Unread 08-18-2009   #7 (permalink)
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IF the CEL isnt on, no need to check the TPS. If it is on,then thats different. Most surging is timing related.
EEC IV systems suck as far as code retrieval and storage. It couldn't hurt to check the tp voltage anyway.
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Unread 08-18-2009   #8 (permalink)
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i tried adjusting the tps and cleaning the iddle air and it did not fix the problem. does any buddy have any more ideas.
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Unread 08-19-2009   #9 (permalink)
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try cleaning the mass air see if that helps but more than likely it will be timing. Bring the motor up to top dead on cylinder 1 and see if the balancer slipped. It has been known to happen. Butr i would check the mass air first, its easy to clean and they do cause odd ball crap to happen
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Unread 08-19-2009   #10 (permalink)
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Where is the Timing at?
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Unread 08-19-2009   #11 (permalink)
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With the engine running/idling, pull the vacuum hose off of the EGR valve and see if the hose is pulling vacuum. At idle, this hose should NOT be pulling a vacuum.
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Unread 08-19-2009   #12 (permalink)
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Originally Posted by Pricester78 View Post
With the engine running/idling, pull the vacuum hose off of the EGR valve and see if the hose is pulling vacuum. At idle, this hose should NOT be pulling a vacuum.
if it is, you will notice an immediate increase in idle quality, once you pull off the hose.
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Unread 08-19-2009   #13 (permalink)
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do you remember the tsb# for a idle surge related to the tab/tad solinoids, big G
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Unread 08-20-2009   #14 (permalink)
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tsb 90 12 7 and 90 3 1 , big G
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Unread 08-20-2009   #15 (permalink)
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i fixed the problem. the vacum hose from the pcv to the intake was cut. when i replaced it the problem went away.
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