tmking66

Ok, my 82 dies every time I mash the gas pedal. When the car is at idle and I press the gas the car sputters and dies. If I gently mash the gas very carefully I can keep it running. Once it gets up to about 2k rpms it revs strong all the way to redline so I don't think its is a fuel filter problem. It gets smoother as the rpms build.

I am thinking possibly the accellerator pump in the carb. may be bad. This is an auto transmission car. Putting the car in gear also kills it unless I build the rpms up first and keep the gas pedal down after shifting into gear.

Any thoughts or other possibilities????

Myc1972

That sounds similar the problem i am having with my 81, but the other way
around when i hit the gas.

Maybe they are related. Hopefully we will find our answer.

Kentetsu

Start by checking your timing. Also, while you're at it, verify that you have spark on all plugs. Your ap is probably causing some of these issues, but I doubt that's all you have going on.

slashdawg00110

If it dies when you mash the pedal but doesn't when you gently press the pedal, I'd bet it's the AP, assuming you still have the stock Nikki carb. Try this: remove the air cleaner box, then look down the primaries as you manually move the AP lever. You should see shots of fuel coming from both nozzles that stick out from the center.

If you don't see a good shot, check a few easy things:

1. Check the rear float bowl level. The AP draws on the rear bowl only, and low level = no pump shot.
2. Adjust the pump by turning the nut on the pump rod.

You can do both of these without starting to take the carb apart.

85rotarypower

Most definatly an Accelerator Pump (AP) problem. Chances are your linkage has either broken or detached (not likely), or the pump diaphram is cracked or ripped. FYI, the AP is on the lower right hand side of the carb looking at the carb from the drivers side of the car.

tmking66

When you say "look at the AP shot" how much volume and pressure are we talking about. I can see gas coming out but I would not describe it as a "shot", more of a slow stream. Should the gas be spraying across the carb. barrels?

Kentetsu

Well, pretty much a "good squirt" is what you're looking for. Hard to describe, but yeah, should be a healthy stream of fuel, only coming out like a squirt...Hell, I don't know how to describe it. If it's not just a dribble, then you're probably alright.

mjg80918

ok before you start buying stuff for it, check one thing. i had the same problem with my 84 GS stick. its not getting enough POWER to keep the fuel pump going when you mash the peddle down. get a volt meter and see how many volts you have going to the fuel pump. the connectors are under the cubby's behind the DRIVERS SEAT. check iand make sure you have enough there. i didnt so i started by aligator clamping the wires to my cubby hole lights and could only use my fuel pump when my interior lights were on. still it would work but wasnt getting enough power. so your best bet is to use a toggle switch and run it from the battery to the switch to the pump. but my fuel relay was out to i dunno. but yeah it deff sounds like you have a power supply prob. idk i could be wrong though

tmking66

Is the fuel pump supposed to get a full 12 volts for normal operation? I have not ruled out the accel. pump yet. But this sounds like something easy to check. Also, when I got this car it had an aftermarket fuel pump on it. One of the generic brands Advance sells over the counter. It was pushing too much fuel into the carb. (flooding it) so I replaced it with a stock pump. Maybe I screwed something up changing out the pump. However, why if the pump is not getting enough power at idle would the car stay running as the rpms increase gradually? I do not notice any signs of increase elec. flow as the car revs. higher. But this is definately worth looking into and even if it is not THE cause it definately could be a contributing factor.

slashdawg00110

If the pump isn't getting enough power, then you'd see fuel starvation. The float bowls would empty or get too low for the vacuum signaling to work properly.

I really think this is a AP problem, probably a bad AP gasket.

Rx7carl

Yea classic AP problem, could even be sticking internally. Your good info leads me to that conclusion. Move the throttle manually (engine off is fine). If the squirt doesnt happen as soon as the throttle moves then your AP isint functioning properly.

tmking66

Thanks guys for the input so far. I had another look at it this afternoon. There seems to be a good squirt of gas flowing when I open the throttle. The accel. pump functions and delivers the fuel. So, I started it up, let it run till it was warm (choke popped in) then I went to observe what was happening while it was running.

Now, when I opened the throttle I hear a hissing sound just as the engine is about to die. If I close (please excuse me if I use the wrong terms here) the shutter above the primary carb. barrels the engine will rev. without dieing. If I leave that shutter open and try to rev. the engine I hear the hissing sound and it dies. As long as I close that shutter (which also increases the rpms when I do that) I can open the throttle as quickly as I want to without killing the engine. If I do not hold the shutter closed it hisses and dies when I open the throttle.

Based on this, any ideas as to what this may be? I cannot make out exactly where the hissing sound is coming from. Sounds like somewhere on the drivers side of the carb. but it is difficult to tell.

Kentetsu

Hmm, only idles with the choke flap closed, eh? You sure you don't just need to adjust your idle speed/mixture? Have you checked all of the lines around the carb for vacuum leaks?

tmking66

No, it idles OK without doing anything. The idle is a little high (850-900 rpms), that is a low as I can get it and keep it running. I have check and recheck for vac. leaks and found none.

It only has trouble when it is idleing and I open the throttle. Then I hear a hissing sound (like a lot of air being sucked in somewhere) and then it dies. It only dies when I try to take it from an idle to higher rpms quickly. Once it gets up above 2k rpms I can floor it and it revs normally. Anything much below 2k if I mash the gas it hisses and dies quickly. What I discovered today was that by holding the shutter above the primaries closed while the car is idleing I could open the throttle quickly and it would rev almost normally. Does this still sound like accel. pump problems?

Kentetsu

Did you ever check for spark on your plugs, and verify your timing?

tmking66

I have checked the timing although according to the Haynes manuel the car is supposed to be in gear at idle when the timing is set. I can't keep this car running at idle when it is in gear so I had to set it with the car idleing in neutral. Not sure if that makes any difference or not. I am pretty sure that I have spark. The car starts right up and once it gets past 2k rpms it revs smoothly all the way to 6k. It does need fresh plugs. The ones that are in it are a bit old but I wouldn't think that would cause the problem I am having now would it.

RUBY7

My sons capella does not get driven much, this exact thing was happening with it as well. Eventually pulled the carb apart and found literally chunks of crap in there. Cleaned it out and bobs your uncle all good.

Might Help.

tmking66

Yeah, I pretty much think that a carb. rebuild is in order. I just wanted to make sure I am not missing anything else and also what part of the carb. is causing the problem I would really hate to rebuild the carb. and have the same problem going on after I re-install it.

dj55b

iTrader: (2)

Hey,

My car was started doing the exact same thing today as your car? weird ... was working fine a couple of days ago ... i even did a couple of drifts and pulled strong. These are other syptoms that i'm seeing.

Engine doesn't want to rev very high at neutral or underload, seems like anything after 3k sucks and it really really hard to get it up there ... like i floor the pedal and almost doesn't do anything. I will be looking into that first thing tomorrow morning and i'll let you know what i find out. Hopefully i can help you out without doing a carb rebuild.

Also forgot to mention that it also idles fine and then when trying to pump the gas hard it dies, i did play a bit with the mixture screw yesterday and at that point of time it seemed to have helped (but it might of also been just the ATF that i added in there. Will let you know tomrrow what happens