Lurching on Acceleration. Help?

[jackrabbit]

Alright so Trinker's 32/36 just recently started giving me trouble on acceleration where it starts to lurch real bad. I checked both idle jets for clogging, cleaned out the secondary and replaced the primary (running #55 on the primary and #50 on the secondary). No luck. Where to look next? The lurching is normally worst from ~1500-3000 RPMs and once it gets up to freeway speed in 4th they become much less noticeable (perhaps just because of the speed...).

[allbim]

Give it a throttle-tune. Give it full throttle and just as it reaches full RPM, close the choke. This will clean out any rocks, mice or other things stuck in the carb.

Caution; don't do this while driving unless you have a manual choke.

Seriously, throttle-tunes sometimes work.

[Guest Anonymous]

I like the qwote "95% of your carb problems are ignition related" check the basics before u rejet the web meister

[Mike Self]

down the primary barrel throat (the one closest to the pax side) and work the accelerator linkage. You should see a squirt of fuel emerging from a little orifice on the forward (towards the front of the car) edge of the primary throat. That's the accelerator pump nozzle, that gives you an extra squirt of fuel when you suddenly accelerate. No squirt=malfunctioning accelerator pump, which can cause lurching under acceleration as the engine is momentarily starved for gas. Easy to replace the pump diaphragm.

But do check your ignition timing, point gap, plugs etc too. That quote, incidentally was what my late and sorely missed father-in-law told me back when he was teaching me how to work on cars (so mine wouldn't break down when his daughter was out with me). And he was usually right!

cheers

mike

[Guest Anonymous]

Mike, Its an honor to see your reply, have enjoyed your writing for years. My goal is a 69 2002 and you have owned one from birth, look forward to building one just the way I want, stock looks with ti inards, not a race car but a custom classic, bought my first 76 from picnpull for $375, complete car and such an easy build, got spoiled by the ease of it, second was an ebay buy, a sweet 70 roundie that had bad rust worms, loved the car but too much to handle, now I lucked into an original paint 76 for $500 bones, I look to the stars and thank the creator for blessing me, I look forward to driving said car to SF and parking her at pier 39 and loading the trunk with sour dough, clam chowder and trinkets for the grand kids, mama told me to be a simple man and thats my plan, I hope you understand.

Dave Miller

DBMW2002

76 Golfie Screamin Yellow Zonker

97 BMW 328is For when you absolutly positivley have to get there fast.......

[c.d.iesel]

.....you've got one seriously f'd up distributor

look at the point plate mechanical advance function

non-functioning

....that is if you really have no problem with the carb as you state

[jackrabbit]

Checked her accelerator pump and everything looks good there. Going to do timing. Had a friend check her out and he said it seems like it is misfiring. If it is the distributor, what should I be looking for when I open it up.

[TobyB]

Check your driver's side engine mount...

t

[bourkeco]

Check your driver's side engine mount...

t

Check all your mounts... I'm with Toby

[jackrabbit]

Just replaced all mounts a month ago :/ The engine definitely feels like it's missing where it will start to accelerate and then it will temporarily lose power, lurch, then pick back up. Then it will pretty much continue doing that until you shift or let off the throttle.

[bourkeco]

Just replaced all mounts a month ago :/ The engine definitely feels like it's missing where it will start to accelerate and then it will temporarily lose power, lurch, then pick back up. Then it will pretty much continue doing that until you shift or let off the throttle.

Yea Toby that was stupid!!! LOL checked your fuel pump? and filter?

[TobyB]

yeah, that WAS stoopid... heh... If your float bowl's not fulla junk,

then maybe you're not getting fuel flow.

Easy to check- put a gauge on it. If it drops to (near) zero, there you are.

t

[bourkeco]

yeah, that WAS stoopid... heh... If your float bowl's not fulla junk,

then maybe you're not getting fuel flow.

Easy to check- put a gauge on it. If it drops to (near) zero, there you are.

t

Ill take the backlash as well as you did ( I promiss)...

[TobyB]

what, no barebottom spanking? I was so hoping....

all in fun,

t

[bourkeco]

Guessing minds want to know!