'76 Spider bogs down under acceleration

jprisbe · Post by **jprisbe** » Sun Apr 16, 2006 8:23 am

First drive of the season a week ago and had no problem.
Took her out Monday and Friday nights and the following happened both times. Monday it happened after we went to dinner and were on the way home and Friday night it happened much sooner, only a mile from the house.

I start and warm her up with no problem.
I can give her plenty of gas before I take off and no problem.
I drove slowly for 1/4 mile (we live a 1/4 mile down a dirt road).
I got to the pavement and started to accelerate but when I got into 3rd gear she bogged right down. Car never actually dies and idles fine before and after this occurs.

Monday night I had her towed back home. After she was unloaded I started her up (she had been sitting for a good hour) and she bogged right down just sitting there. I pushed her in the garage, pulled the air cleaner started her up and the problem was gone, at least when not under load.

Friday night I tried again and same problem occurred sooner, only a mile from the house.
I pulled the air cleaner and manually operated the throttle (while sitting
still) and she bogs right down.
Choke is wide open at this point.
I can see a good shot of gas when I first push on the throttle.
I pulled the gas filter and it had no crud in it.
I pulled the fuel screen and it had no crud.
I put a new clear gas filter in for observation.
Can see plenty of gas going into the filter and it does not run empty.
All vacuum lines were replaced last year and I can find no leaks.

To get home Friday night I loosened the choke housing and rotated it counter-clockwise to close the choke about Â½ way and she ran fine. I zipped up and down the road for a few miles each way and she ran like a top.

What should I be checking?

So Cal Mark · Post by **So Cal Mark** » Sun Apr 16, 2006 1:10 pm

if you partially closed the choke and improved it, then the engine is running too lean. If the car sat all winter the fuel in the carb may have turned to varnish and plugged a jet. Try spraying carb cleaner down through the air jets, then do the same with compressed air to open the main jet.
Wear safety glasses or cover the top of the carb with a rag while you're doing this!

YeLLoWBoAt · Post by **YeLLoWBoAt** » Sun Apr 16, 2006 1:24 pm

It could also be a intake leak, when you applyed the chock you boosted the "signal" too the carb( IE vaccum level). Which in turn increased the gas flow thru the carb.

So Cal Mark · Post by **So Cal Mark** » Sun Apr 16, 2006 1:32 pm

an intake leak would cause a very rough idle though

jprisbe · Post by **jprisbe** » Sun Apr 16, 2006 5:45 pm

Mark,

Your suggestion seems to have done the trick.
I cleaned the jets and blew air through them.

Just got back from a drive and she ran like a top.

Thanks,

Danno · Post by **Danno** » Sun Apr 16, 2006 6:11 pm

jprisbe wrote:Just got back from a drive and she ran like a top.

around in circles really fast until it just fell over?

So Cal Mark · Post by **So Cal Mark** » Sun Apr 16, 2006 9:19 pm

when a race car is running like a top, that means it's spinning out alot!

jprisbe · Post by **jprisbe** » Mon Apr 17, 2006 7:11 am

How about like a champ