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Re: Between 50 and 60 mph my 66 Mustange surges.
If you are like me You only want someone to Answer this that has been there. The Carb needs Adjustment. One barrels are Notorius for loosing Adjustment, Especially since it is the Original. Drop me an E-Mail and I will send you Pics of MY Babies!!!! MrScary6661313@aol.com
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code p 0340 refers to camshaft position(CMP) sensor A , bank 1---circuit malfunction==== causes--wiring---CMP sensor---ECM
if the wiring is broken or loose or not making continuous contact the problem of the surging could be the ignition control module not knowing when to fire so it could be late or early
check your wiring for burns , breaks , corroded connections , then replace the sensor
Mar 17, 2012 - 19 posts - 7 authors
[Archive] Enginge surges RPMS drop while driving OEM Issues. ... I so hope somebody has a clue as to what is causing my '02 Envoy's (182k) engine to ... I'll be driving and when I get up to around 35 - 45 MPH sometimes my ...
Change your ignition key module and that will fix the problem. Problems with key modules can be attributed to the weight of the owners key ring. Some people have massive key rings with all sorts of gadgets on them causing them to become very heavy. This puts an unexpected load on the key module and the load can double with it swinging from side to side ect... Best advise, keep the key ring simple and light.
sounds a little like a cruise control problem. they used to have a centering adjustment that kept the speed within a range. If the range somehow shifted to the high end this would cause your surge. it would be a screwdriver slot on the outside of the case.cw increase ccw decrease. yours is set too high or cw. I work the screw back and forth several times in case dirt entered the cruise module.
the '65/'66 C4, was known as the "Green Dot" C4 & has a different
shift pattern to the '67/later C4's.
So your C4 tranny is the green dot which is an UPGRADED option. A better tranny better gears and stronger parts and what not, there was also the white dot tranny that was the cheaper or less performance transmission. As far as i understand the white dot was available for better fuel consumption HAHAHA which no one really cared about in 66 anyways.
In '65/'66 it was something like this:
P - Park
R - Reverse
N - Nuetral
White Dot - Starts in 2nd, automatically shifts to 3rd
Green Dot - Starts in 1st, automatically shifts to 2nd and 3rd
The ignition module is integrated within the ignition coil itself,
and the only repair possible is to replace the entire coil assembly.
There are six ignition coils, therefore there are six ignition
modules. Fig.: Exploded view of the 2.0L engine coil pack assembly
Fig. : Exploded view of the 2.5L engine coil pack assembly
Remove windshield and rear window to do it properly. Headliner is actually crimped in between window gaskets and roof edge. Not a job for the faint at heart. If you don't know the string trick to get your gaskets in place you'll be working on it this time next year. Look on CJ Pony parts web site. They used to have a good tech article on headliner replacement. Hope this helps...
The only place that I know that has a wiring diagram is the factory shop manual which is available thru any thunderbird restoration parts suppliers or ebay. If the electronic ignition, they called it transistorized ignition in 66, is original, you might consider changing to a point type ignition or a later electronic ignition or aftermarket like Petronics. The parts for the original transistorized ignition are very hard to find and even more pricier.