I have one.....haven't used it except for in the garage. Of course at idle the mech. fuel pump flucuates, so it's hard to get a good read on it.

I'll try your suggestion.......

 

Edelbrocks reply to my email........



If you are using a narrow band O2 censor, they are not that accurate. If you are going to tune your car with a A/F meter I would recommend using a wide band. What brand of A/F monitor are you using? On both of the carbs have you checked the float levels? Also while driving is it possible to use a remotely mounted fuel pressure gauge and watch the pressure? Possibly under load the fuel pump is doing something strange.



Chris Wiesinger

Edelbrock Corporation Tech Department

 

the acc. shot is good ????

 

My '81 (100% stock) once had a hesitation problem off idle. It would only happen when the car was fully warmed up. There was no hesitation when accelerating with a cold engine. I thought I had a fuel delivery problem, but the problem was bad plug wires. The metal shields around the plugs were somehow robbing spark. A fresh set of plug wires solved the problem.

 

I'm really not sure what you are talking about comp....I saw this earlier about accelerator shot, but I don't know what you are talking about....

 

Hey biker....new plugs and wires, however, one of the wires has a scorch mark on it.....

I have not checked the floats, will do soon......funny, I'm using an Edelbrock A/F meter...........I'm also going to check the fuel on load. Eliminate, eliminate.......It's pretty much down to this, and direct carb issues....

 

I'm having exactly the same problem. Followed a build up from Chevy High Performance a fews years ago using a Goodwrench 350 create motor with Edelbrock Aluminum heads, Performer Manifold, Comp XE-262 Cam, MSD ignition and the same carb as you. It's a slug off the line (worse than the 78' 220 HP smog motor I took out!). It starts good, has 17" Vac and 7 PSI fuel pressure. I'm very interested in what you find to fix yours

 

Check the accelerator pump system for proper operation.

BigBlockk

Later.....

 

If you are talking about the pump shot, I have adjusted it. If not, explain more on the accel. pump system please....

 

Round 3....ding, ding, ding.....

I am about ready to throw my hands up in the air, quit, and sell the damn car.....

The floats were off.....they were hanging about 1 1/2" instead of 1". I adjusted, and it did run better, the A/F meter quit leaning out, but it still won't get out of the whole. It's like a 3 second delay and then wham....it will kick in......

Came in, played with timing some more. Tried to more spring combinations, one step stronger, and one step weaker than I had in. Damn thing leaned on me again. Had to twist the IM screws hard to get it out of the red......

Something weird is going on........gonna sleep on it tonight, but I have some serious fuel issues. Trash in line or something....When I pulled the old fuel filter it looked very clean.

I going to check the fuel press. under load as well....then I will give up....

Somebody smarter than me is going to have to fix this car.....Time to beg GM mechanic friend to come to the rescue.

 

And buy a Holley??

Brett

 

Is the car bogging down right as you hit the gas and then it launches off and pulls real well? If this is what's happening, then the secondaries could be coming in too early and dumping a whole lot of gas in the carb.

 

You don"t need a holley . I have a E.B> 1405 on my 66 GTO 389 no problems with bogging or off the line stumble. What rear gears are you using? I hve been watching your thread on this problem.The fuel pump will only come into play after you have run the car . If the carb bowel is full on a test drive and you have a bogg ( car falls off then picks up accelerator pump could be the problem) or you may not have enough rear gear to make the motor wind quick enough. Is the car a automatic or manual? could be if it is a auto that torque convertor does not have enough stall so that motor can rev up quick enough to take gas.

 

I think you are on the right track performer....Here's the latest update....

Talked with an old mechanic friend for about an hour this evening on the phone. Ran down the whole situation. He was scratching his head until we the conversation turned to what I had disconnected and left disconnected from the computer crap removal, and the new carb install. Somehow he asked me about the trans kickdown cable.....Of course I said "what"? He said it's the cable that ran to the carb with the black plastic end on it. Hmmmm....I thought, the only thing I didn't hook back up was the "two" hookups for the cruise servo......He immediately replied, "two hookups?"

I'm not 100% positive that this is the problem, but my money is on it. It's not hooked up. I thought it was cruise control related, and it's just laying on top of the intake. When he explained that the cable ran to the tranny, and that is what controls you gearing down the automatic when you punch it, and the fact that without it I was probably trying to get out of the hole in second gear, it all clicked.....

Also would explain why I can kick it in a 40 and not get alot of response.....

To late to check now, but I will tomorrow. I can't believe this is it, and if I have wasted 3 weeks of my life (actually more) on trying to get this running right, and that is the cause, I APOLOGIZE TO THIS BOARD FOR MY STUPIDITY!

 

MSVetteMan
This has been an excellent thread...or threads on how to troubleshoot problems with the fuel/timing systems. I am sure this discussion has helped more people than just you. All of the discussion has been objective. I am sure many young vette owners have learned a lot...and most likely a few of us old geezers have picked up a few pointers also.
I sure do hope the tranny cable fixes your problem. If it still boggs...sounds like this is the problem now...I would work on the secondaries of the carb as the meetering rods are probably opening too soon and letting too much gas into the system....it then takes a few seconds for the motor to catch up. After they open up and nothing happens they shut back down.
I like the fact that you have listened to good advice and tried to learn for yourself. This is how we all learned. Keep up the good work and soon you will be giving advice to others....
Dave62

 

MSVetteMan let us know of the latest update - This is a real strange problem and hopefully the solution will be quick and easy - Keep on it

 

hang in there it will work

 

Nah. It's been a learning process for you and prolly quite a few on the board. The real benefit will be it's presence in the archives.

Now, about that Holley.....

Brett

 

i didn't think you had been describing a transmission kick down problem?This will probably help the cars performance , let us know if its the fix.

 

yeah dont give up yet...we'll all be there sat. and see if we cant help ya work it out if you dont get it first!
the delay out of the whole this is not a kick down problem thow.
keep work'n on it and hang in there man!
we'll see ya saturday for bug's and beer!