View Full Version : Bucking SC, then runs Great

04-07-2003, 12:42 PM
I have a 90SC 5spd 10% OD 140K miles ran like a top until lately.
Car drives perfect, then all of the sudden it starts to buck, like it dropped a cylinder, may do this for a few seconds-a few minutes, then runs & drives perfectly again. also while sitting & idling the same thing happens, runs perfect, then idles roughly, up & down fron 600-900 Rpm, might do this a few minutes, then smoothes out & runs perfect. It seems like a sensor, could it be the IAC?
anyone out there ever experience this:confused: Keith

04-07-2003, 01:23 PM
My car does the same thing at idle, whether warm or cold, it sucks, but i am still looking on a way to fix this, if you get any info, email me at [email protected] it would be greatly appreciated

04-07-2003, 01:29 PM
I have had the same experiences twice and each time it was the cam sensor, about $35.00. Good luck,

04-07-2003, 01:45 PM
Same thing happened to my car. Change the CAM position sensor.
$35 from auto zone. Easy to change. Search on CAM position sensor, you will find article and steps to change it.
good luck

04-07-2003, 10:36 PM
Cam sensor

04-08-2003, 12:23 PM
camshaft sensor assembly is not a easy as going to a part store and "throwing it in".
1. set #1 cylinder to 26 degrees after top dead center of the compression stroke.
this is the first step in 17 steps the haynes do-it-youself book
i would like to put a new sensor in my car but i have no idea where to start.
p.s not one word of the first step makes any damn sense to me.

can someone help?

04-08-2003, 12:33 PM
Im sure its a simple bolt on unless you take out the cam sensor housing and disturb the timming. The whole shaft that is.

04-08-2003, 12:42 PM
Changing the Cam Sensor is very simple, the hardest part is finding the right sized wrench to take it off. I think its a 5.5mm, just take them off and put the new 1 on, nothing complex.
It could also be the Air Bypass Valve, behind the SC on the drivers side, if it is sticking, the same thing can happen while under boost, I just spray it with WD40 to fix. Good luck.

04-09-2003, 02:36 PM
youre right changing the cam sensor is actually really easy, i was looking at the instructions on how to change the cam sensor and the synchronizer assembly.