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Username Post: Having a MAJOR problem. . .        (Topic#365923)
craig32 
Frequent Contributor
Posts: 1367

Age: 59
Loc: PA
Reg: 08-05-07
07-27-21 03:23 PM - Post#2823989    

My 55 has been starting hard all year. (265, points engine, WCFB) I've been driving it for 6 years without issue, and suddenly it's starting hard. I had the carb rebuilt, replaced the coil and resistor and thought maybe the switch was going bad. I put a pushbutton on it, and it seems to fire right up with that when the key doesn't want to work, if I leave the switch ON and use the button. Thought all was good until I tried to drive it to work a couple weeks ago. I got it going and about a half mile out, it starts cutting out, bucking, backfiring, and when I threw in the clutch, it quit. I let it back out and the tires chirp and it starts up again. It seems to run OK in first and second, but as soon as I put it in third (3 speed) it starts bucking again. After I limped it home, I changed the fuel filter, and put a vacuum meter on it, and it's pulling 21 inches consistently at idle. I can wind it into the twilight zone in the garage, but when I take it out again, it dies just like before. I did a compression test and all 8 cylinders are between 170 and 180, all plugs are throwing a fat spark, although one is a little weak. I have NO CLUE what is wrong. Does anyone have any ideas?

66 Impala (almost done!)
56 Stepside shortbed
55 Bel Air sedan
81 Corvette
02 Monte Carlo (bought new)


 


LtFrankDrebin 
Super Senior Member
Posts: 5293
LtFrankDrebin
Loc: Coopersburg, PA
Reg: 01-25-01
07-27-21 06:14 PM - Post#2824006    
    In response to craig32

So you're saying that you got a different behavior by messing with the ignition switch? Can you bypass the ignition switch altogether (hotwire the car) and see what happens?

'56 210 Townsman wagon 6cyl/3spd OD | '58 Impala Sierra Gold 348


 
craig32 
Frequent Contributor
Posts: 1367

Age: 59
Loc: PA
Reg: 08-05-07
07-28-21 04:17 AM - Post#2824020    
    In response to LtFrankDrebin

  • LtFrankDrebin Said:
So you're saying that you got a different behavior by messing with the ignition switch? Can you bypass the ignition switch altogether (hotwire the car) and see what happens?


No, I didn't mess with the ignition. I have a pushbutton with alligator clips I use for testing. And a hot wire made no difference.

66 Impala (almost done!)
56 Stepside shortbed
55 Bel Air sedan
81 Corvette
02 Monte Carlo (bought new)


 
japete92 
"7th Year" Silver Supporting Member
Posts: 1737
japete92
Loc: No. Virginia
Reg: 01-18-13
07-28-21 06:47 AM - Post#2824032    
    In response to craig32

If you have not changed points (you did not say), condenser, rotor and plugs in six years, my first job would be a full tune-up (distributor cap too). It may not solve your issues but it's due. Verify/set timing after dwell.

If it idles fine, it 's not the switch. The switch does not know if you are driving or sitting.

A fuel pump not putting out sufficient pressure can (just a possibility) cause your issues. There's enough pressure to provide flow at idle, but not under 'load'.

Plug wires? Worth a look.

After you know the ignition is good, then look at carb.

Just trying to be helpful.

Pete



 
craig32 
Frequent Contributor
Posts: 1367

Age: 59
Loc: PA
Reg: 08-05-07
07-28-21 07:55 AM - Post#2824035    
    In response to japete92

  • japete92 Said:
If you have not changed points (you did not say), condenser, rotor and plugs in six years, my first job would be a full tune-up (distributor cap too). It may not solve your issues but it's due. Verify/set timing after dwell.

If it idles fine, it 's not the switch. The switch does not know if you are driving or sitting.

A fuel pump not putting out sufficient pressure can (just a possibility) cause your issues. There's enough pressure to provide flow at idle, but not under 'load'.

Plug wires? Worth a look.

After you know the ignition is good, then look at carb.

Just trying to be helpful.

Pete


Pete, I put the car on the road 7 years ago this month, and have put 2100 miles on it in that time. The car is garage kept, not driven in inclement weather. I did change all that when I got it on the road, that's all it has on the parts. I put a different carb on it, same issue. A guy told me he had an issue like it and plug wires worked for him. Might have to get a fuel pressure gauge - what should it be?


66 Impala (almost done!)
56 Stepside shortbed
55 Bel Air sedan
81 Corvette
02 Monte Carlo (bought new)


 
japete92 
"7th Year" Silver Supporting Member
Posts: 1737
japete92
Loc: No. Virginia
Reg: 01-18-13
07-28-21 10:21 AM - Post#2824044    
    In response to craig32

"... that's all it has on the parts..."

If you are saying 7 years and 2100 miles is 'all', a full tune up is over due. TIME degrades the contacts.

Fuel pump pressure? From memory, the max for high performance engines was 7 psi and the others were 6 1/2 psi. Recommend check the Shop Manual to verify (but, there's not much difference except at high rpms).

Pete



 
bobb 
Super Senior Member
Posts: 5882

Loc: paradise
Reg: 09-05-03
07-30-21 09:23 PM - Post#2824189    
    In response to craig32

you may have a colapsed ruber fuel line. use fuel injectoin line.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
craig32 
Frequent Contributor
Posts: 1367

Age: 59
Loc: PA
Reg: 08-05-07
07-31-21 10:31 AM - Post#2824207    
    In response to bobb

I replaced the fuel pump and the rubber line, both appeared to be good, but it seems to have fixed the issue - for now anyways. Thanks everyone for the help.

66 Impala (almost done!)
56 Stepside shortbed
55 Bel Air sedan
81 Corvette
02 Monte Carlo (bought new)


 


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