Car running like crap...

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Nov 10, 2005 | 09:26 AM

#41

Stewart's74

Thread Starter

Safety Car

Joined: Aug 2000

Posts: 3,943

Likes: 44

From: Florham Park NJ Port Credit Ontario

Quote:

Originally Posted by bobs77vet

why not disconnect the fuel line and crank the car for a measured period of time and see what kind of flow you get out of the fuel line? actually measure it ...and then compare flow/time...

Bob, I'm a freekin HOBBIEST! I dont know squat about flow/time...It sounds like some sort of math problem to me....I hate math. I spent the better part of my college career trying to aviod math! I'll just spend the $30 and throw the old pump into the garbage. It's not shiny anymore so Imight as well swap it out...thats what real Hobbiests do...

Nov 10, 2005 | 10:20 AM

#42

bobs77vet

Race Director

Joined: Sep 2004

Posts: 11,874

Likes: 263

From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod

amen brother.....use a really long ratchet extension from the wheel well for one of the bolts and rememember there is a bolt in front of the engine that you can take out and put in a longer bolt to hold the fuel pump push rod in place

Nov 13, 2005 | 05:16 PM

#43

Stewart's74

Thread Starter

Safety Car

Joined: Aug 2000

Posts: 3,943

Likes: 44

From: Florham Park NJ Port Credit Ontario

Looks like the Hobbiest fixed his car...without cutting a check!
I tried another coil, took for a road test and had the same problem. So it wasnt the coil.
Removed the plugs, they all looked good. No obvious problem.
Re checked dwell. It was right on 31. It hadnt changed.
I re-checked the secondary wind up spring. It seemed very loose. I adjusted it per Lars instructions. Took for another road test and the problem disappeared.
I'm guessing it was the wind up spring being too loose.
Either way, it runs like it should now.
VICTORY!

Nov 13, 2005 | 08:31 PM

#44

80TexasC3

&amp;quot;Rodstoration &am p;quot; In Progres

Joined: Jun 2004

Posts: 1,397

Likes: 1

From: Frisco TX

I'm dealing with this same problem on my 80... Has an edelbrock thunder 650 with upgraded MSD Dist/MSD Coil and MSD Digital 6.

One of the earlier posts notes a member's car that ran fine while cold (so does mine!)...once warm it really hesitates under full throttle around 4000 and up RPM. Coil?

Also, the Edelbrock Thunder has a secondary spring loaded valve...could this be the issue...I haven't changed anything on this since it ran fine!

Thanks in advance for ANY help!

Running like crap in Texas...

Nov 13, 2005 | 10:26 PM

#45

bobs77vet

Race Director

Joined: Sep 2004

Posts: 11,874

Likes: 263

From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod

good job!

Nov 14, 2005 | 05:47 PM

#46

yellow71

Instructor

Joined: Oct 2004

Posts: 124

Likes: 1

OK I will ask the dumb question -

What is a "secondary wind up spring"?

Thanks
Neil

Nov 14, 2005 | 07:36 PM

#47

madmike

Racer

Joined: Feb 2004

Posts: 265

Likes: 1

From: Irwindale Ca

i will second that motion... "secondary windup spring?"

Nov 14, 2005 | 09:02 PM

#48

David Ey

Burning Brakes

Joined: Sep 2004

Posts: 1,167

Likes: 2

From: Ft.Worth Texas

It is the spring that goes into action after the primary windup spring has sprung.

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Nov 15, 2005 | 12:25 AM

#49

mpassmore3

3rd Gear

Joined: Nov 2005

Posts: 3

Likes: 0

i once had a friend who had the same problems in another car, check the actual plug wires for a warn spot. possible you are grounding out a cylinder or two.

Nov 15, 2005 | 02:17 AM

#50

Kalway

Safety Car

Joined: Dec 2004

Posts: 4,071

Likes: 0

From: San Diego CA

Damn... I'm too late to tell you to check the secondary windup spring. Yeah that's the problem.

(sarcasm for those with their detectors off)

Nov 15, 2005 | 09:55 AM

#51

AGVI

Race Director

Joined: May 2003

Posts: 11,814

Likes: 9

From: Science Bitch! Mississauga, Ontario

Canadian Events Coordinator

Quote:

Originally Posted by Stewart's74

Either way, it runs like it should now.
VICTORY!

Good job Stew!!!

Nov 15, 2005 | 10:18 AM

#52

lars

Tech Contributor

Joined: Aug 1999

Posts: 14,377

Likes: 6,377

From: At my Bar drinking and wrenching in Lafayette Colorado

Quote:

Originally Posted by yellow71

OK I will ask the dumb question -

What is a "secondary wind up spring"?

Thanks
Neil

It's the adjustable windup spring for the secondary airvalve on a Q-Jet. Its adjustment is critical for proper tip-in of the secondaries since its tension determines the fuel shot the secondaries deliver upon opening (like a secondary accel pump). If the tension is inadequate, the car will fall on its face instantly upon secondary opening due to a lean-out condition.

Nov 15, 2005 | 10:21 PM

#53

fcoppola

Instructor

Joined: Dec 2001

Posts: 225

Likes: 0

From: League City TX

Quote:

Originally Posted by Brandywine

Whatever else is happening, it sounds like your plugs are fouled. Pull a plug, and you'll get more info about the problem. Anything unusual coming out the exhaust?