Re: IML: Surge At Hiway Speeds

[randalpark@xxxxxxx]

A large vacuum leak would definitely effect the smoothness while 
cruising, and and at idle as well. It would normally also cause the 
engine to back fire through the carb on acceleration. This can destroy 
vacuum diaphragms throughout the car.

Paul W.


-----Original Message-----
From: Robin Giesbrecht <robings@xxxxxxxxxxx>
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Sat, 7 Jul 2007 12:01 pm
Subject: Re: IML: Surge At Hiway Speeds


Appreciate the replies. The engine has about 15,000 miles from a total 
rebuild with double roller timing chain. So that is not the problem 
this time around. Went out to the parking lot at lunch break yesterday 
and did a wrench check on the intake manifold bolts and the carb mount 
bolts ( suspect vacuum leak). All were relatively loose so I tightened 
them all up. Will do a test on it Monday. 
 
Robin Giesbrecht 
72 Imperial 
 
> From: Tim Durrer <tdkd99@xxxxxxxxx> 
> Reply-To: mailing-list@xxxxxxxxxxxxxxxx 
> To: mailing-list@xxxxxxxxxxxxxxxx 
> Subject: Re: IML: Surge At Hiway Speeds 
> Date: Fri, 6 Jul 2007 17:35:04 -0700 (PDT) 
>  
> 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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> > 
>  
>  
>  
>  
> ________________________________________________________________________
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