Skip to main content

Closed23 replies

sputtering issues

B bobsled
I have a 2110 with dual Weber 44's. Last week I pulled the carbs, replaced the rotor, cap, replaced the fuel line, and changed the plugs. I cleaned out the idle jets, and took it for a drive. I drove about 10 miles, and the car ran great. I stopped for about a half hour. Later I got back in the car, and after starting it noticed the idle had slipped from about 800RPM to 400RPM. It also started sputtering until the mains kicked in. So I took it home cleaned the idle jets, and it seemed to run great until the engine warmed up. Again sputtering and low idle. I pulled the carbs again, cleaned the idle jets with pressurized carb cleaner. No change, so I pulled the carbs again, cleaned the idle jets, cleaned the mains, but the issue persists. I replaced the manifold to head gaskets each time I pulled the carbs.

What should I do next? Any help would be much appreciated.

Thanks








1957 Vintage Speedsters(Flared Speedster)
Original Post

Replies sorted oldest to newest

B bobsled
I have a 2110 with dual Weber 44's. Last week I pulled the carbs, replaced the rotor, cap, replaced the fuel line, and changed the plugs. I cleaned out the idle jets, and took it for a drive. I drove about 10 miles, and the car ran great. I stopped for about a half hour. Later I got back in the car, and after starting it noticed the idle had slipped from about 800RPM to 400RPM. It also started sputtering until the mains kicked in. So I took it home cleaned the idle jets, and it seemed to run great until the engine warmed up. Again sputtering and low idle. I pulled the carbs again, cleaned the idle jets with pressurized carb cleaner. No change, so I pulled the carbs again, cleaned the idle jets, cleaned the mains, but the issue persists. I replaced the manifold to head gaskets each time I pulled the carbs.

What should I do next? Any help would be much appreciated.

Thanks








Gordon NicholsGordon NicholsMassachusetts 1993 CMC Supporting Member
When you "pulled the carbs", did you remove both carb and manifold as a unit and then left the carb mounted to the manifold all the time? If so, try replacing the carb to manifold gasket (again, maybe).

If you pulled just the carbs and left the intake manifolds in place, then replace the manifold to head gaskets. Also, make sure you have the proper shaped gaskets for the manifold or carb openings - there are several variations of shape and openings.

One way or another, you have an intake leak somewhere, not a jet clog. As Danny wrote, try spraying carb cleaner around the gaskets and when the idle changes note, that's the one that's leaking.
B bobsled
Well..I tried the carb cleaner test, but didn't hear any change in idle speed when I sprayed it around the head to manifold section or manifold to carb sections on each carb.
I went ahead and replaced the head to manifold, manifold to carb, and the carb to air cleaner base gaskets.
Started to car, and it seemed to run a little better.
I let it idle for about 10 minutes, and drove it around the block.
The issue returned. The idle dropped and it sputtered until the mains kicked in.
I tried the carb cleaner spray test again, but found no change in idle speed. I also check to see if the carbs and everything else was securely fastened.

So it appears that once the engine reaches normal temperature, something is opening up to create a vacuum leak.

What else should I look for before I have a mechanic look at it?

Thanks again.
B bobsled
Looks like I made a little progress today. I had installed one of the fuel filter elements upside down, so I corrected that. The fuel line leading to the rear of the car was close to an oil cooler line which could have caused some heating of the fuel.

When I had one of the carbs out, one of the air mixture screws fell out, so I reinstalled it counting the turns of the other mixture screw as a guide

The engine idles smootly, but still runs a bit rough from idle to about 1800rpm.

I am guessing that I will need to sync the carbs. I've never done this before, but I'll pick up a sync tool this week.

Thanks, everyone, for all of your help!
Post Content
Remove This Ad

Membership Required

We're sorry. You must be signed in to continue. Sign In or Register
×
Are you sure you want to remove from your Block List?
×
Loading...
×
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .
×
Link copied to your clipboard.
×

Access to this requires a premium membership.

Supporting Member

Please help keep us running!

Supporting members have donated about $4.00 a month ($49.00 US per year) paid annually.

  • Priority support
  • Removal of inter-page (between thread) advertisements.
  • Access to Build Manuals
  • Access to Knowledge Base
  • Access to Supporting Members events.
  • Access to Leveraged Group Buying from site Merchants.

AUTO RENEW: You membership will auto-renew after 12 months. If you prefer not to auto-renew, you can cancel your premium membership at any time and it will remain in effect until the end of the 12 months. To cancel, sign in at SpeedsterOwners.com and navigate to: (Your User Name)  > Premium Membership.

PLEASE NOTE: Your credit card will receive a charge from CROWDSTACK PAY, the payment processor, not SpeedsterOwners.com.

$49.00 per 12 Months (plus tax if applicable)
×