Re: IML: Surge At Hiway Speeds

[Tim Durrer <tdkd99@xxxxxxxxx>]

Hmm,I have a surge at highway speeds also in my 73.
103,000 miles. I guess I had better get it checked
out.

Tim Durrer
73 Blue Sky

--- Eric <gearhead@xxxxxxxxxxx> wrote:

> Robin,
> I had a '72 Newport that gave the same symptom. It
> had about 129K on the 
> engine. After doing all the basics- plugs, wires,
> ignition control unit (it 
> had the optional for '72 electronic ignition for
> Newports with the optional 
> 440), and a carb rebuild, it still would surge at
> highway speeds.
> 
> One night my timing chain's nylon cam sprocket lost
> the last bits of nylon 
> coated teeth that were still holding on to dear life
> and let loose causing 
> the engine to die and requiring the timing chain set
> to be replaced.
> 
> After I installed the new chain and sprockets, I
> noted the lack of the same 
> surge that you mentioned. That was the word I was
> using to describe this 
> trouble. Other symptoms that went away after I
> replaced the timing chain set 
> were long cranking times, a resistance of the choke
> to come off of high 
> idle, a lumpy idle, and relatively poor fuel
> economy.. I used to have to jab 
> the throttle to the floor a couple or more times to
> get it off high idle 
> when cold but afterwards, a normal fraction of an
> inch throttling took it 
> off high idle. These symptoms were due to poor
> vacuum caused by out of time 
> cam / valve operation
> 
> One way for you to check your timing chain set is to
> put a timing light down 
> at the timing marker on the crankshaft. If it jumps
> around as the engine is 
> idling, you have a worn nylon coated cam sprocket
> and chain. Do you know if 
> your Imperial's cam sprocket has over 100K on it? If
> so, it's pretty much a 
> given that it should be replaced.
> 
> There is another test is to see how much you can
> rotate the crank before the 
> distributor rotor starts to rotate. Someone on the
> list was just mentioning 
> this and maybe they can give the specifics.
> 
> My Newport ran smooth as silk after the replacment.
> 
> Eric
> 1964 Crown Coupe
>
_______________________________________________________________________
> From: "Robin Giesbrecht" <robings@xxxxxxxxxxx>
> Subject: IML: surging at highway speed
> Any ideas on a surging that is slight but getting
> worse at highway speeds on
> a 72 Imperial. I thought about a possible vacuum
> leak which I have to check
> out with a gauge but what about coil or electronic
> control unit? Any
> experience there? Everything else is great starts,
> idles, power you really
> can't say if there is any difference when you step
> on it.
> Robin Giesbrecht
> 1972 Imperial 
> 
> 
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