Friday I tore my engine down...i'm fitting a RB road race header kit...tacked it up...slapped the old header back on with all the gaskets. Then put the intake manifold back on...again with all the gaskets (were the o-rings in the carb rebuild kit for the intake manifold coolant passages?)

Then I rebuilt the carb...cleaned it out...slapped it back on...but i'm having some issues that I cant seem to solve. I've got all the vac caps and hoses routed again...thanks to the emissions removal guide by rx7carl...but its just running like crap...no idle really unless I crank it up to around 1500rpm...but thats past the idle circuit.

when I have the choke on it seems to stumble slightly...other than that its as smooth as its ever been...then I kick the choke of and it just dies...again...unless I crank it to 1500rpmish. At 1500 it will stumble and surge...as if its loosing its breath...then it catches and will go back to 1500...surge again

It does that for about 20-30 seconds and then will bog a couple times reallllly bad...and die

I've looked for loose/cracked hoses about 20 times now...idle screw is set up around 1500rpm...lower and it wont run...A/F screw is set to aprox 3 turns out

My reason for rebuilding this time is my car refused to idle when cold...it would just surge like mad...and the MOMENT it was warmed up...smooth as glass...very annoying

Any ideas where to start?...I thought it was the idle circuit...but pushing the idle to 1500 rpm should remove it from the equation...diagrams would be nice if anyone has any ^.^

-Adam

 

Perhaps I should have made the topic "Big Hairy Man *******" ^.^

 

Sundays aren't good for help, everyone is crashing. Check your fuel pressure. Make sure to give this a bump in the morning/afternoon.

 

been there heres your bump! it was my fuel pressure simple and easy hope it works out for you.

 

I'll check into the whole fuel pressure thing...there IS gas in the carb but that doesnt mean much...the gas lines are DRY unless I have the key on for the pump to activate.

Thought it might have been a leaky intake manifold...but I solved that problem...not leaking now thanks to gasket sealer ^.^

Theres some slight scratches/gouges on the top of the carb from prying the top off...would those possibly cause it to have an internal vac leak?

Also...if that was the case what sort of liquid gasket sealer is suitable for carbs? I've got some permagasket or whatever its called rated to 700F but it says DO NOT USE WITH GAS...must eat it eh? ^.^

 

Check on fuel

I took the lines off and crammed them into a glass jar...but I had to start the car to get gas to flow...perhaps i'm mistaken but doesnt the fuel pump come on when you turn the car to on...before you physically start it?

after about 2 or 3 seconds I had roughly a tablespoonish ammount of gas in the jar...so I think its working properly

 

You should be getting more than a tablespoon in 3 seconds. If you have a Haynes book it tells you about how much you will get for a given time. Also don't confuse "volume" with "pressure". Also it pays to learn how to "jump" your fuel pump. Again look at the drawing for the wiring of your pump circuit and it's an easy jump.

 

Where is my fuel pump exactly?

I crammed my thumb over the fuel line and had someone crank the car...nothing but air after about 10 seconds. So id say its DEAD...go figure...its only 21 years old ^.^

Also change out my fuel filter with no luck...but ehm...the fuel that came out of it looked like mud...not cool

 

LOL, your pump is right next to your filter. Looking at the car from the drivers side, the pump is to the left of the filter (after the filter if you're thinking about flow) under(on top?) of a cover with a few 10mm bolts.

If you plan on doing any performance up grades it's time to go ahead and step up to a holley or the like fuel pump and regulator.

 

Time to drop the tank and clean it, or you will be replacing a lot of fuel filters, maybe a pump or 2 and rebuilding the carb.

 

I'm looking into just getting a new fuel tank...my fuel float quit working a LONG time ago...and from what I hear its not really "cheap" to replace either...but if its rusting I really dont want to deal with it...plus id like a WORKING fuel guage for once :P

Replaced the fuel pump with a carter (which has its own fuel filter...so now I have two in-line by the tank). That took care of the surging. Still ran like #$(&3e so I stripped the carb down and cleaned EVERYTHING with carb cleaner. Stuck it back together with some gas safe hylomar something or other I got at napa...blue...its pretty sweet. It runs SO smooth...bump the key and its a rock solid 1K on the tach...I put it at 1K cuz the lights pull it down about 200

I have yet to solve that problem...I'm only assuming its because my engine is so small...since its always pulled the rpms down a couple hundred at idle.

Theres only one SLIGHT problem tho...its still "bogging" when I try to get on it. It's as if the secondarys either are opening not enough or too much...I suspect the vac system...may have to attempt to convert to manual.

Lightly pushing the gas to enguage secondarys causes the car to bog some and accel REALLY slow...pushing it further causes the car to start to lunge...which is rather unpleasant.

If I let off a tad...to the point I'm assuming the secondarys wont enguage then the car runs perfectly without a hiccup...it just takes a lot longer to get up to speed than i'd like.

Any ideas?

 

I just had a thought...could my throttle cable be to blame possibly? I'm not sure how its supposed to be set exactly...ive got it set where its tight but not so tight as to pull the linkages open.

 

Sounds like the carb may have gotten some of the contamination from the tank in it. I'm not up on the oem carbs, I usually go after market.

The electrical sounds like a weak alternator or bad electrical connections.

 

check for a collapsed fuel line...I know that once they get to a certain age they lose their resiliancy and when the vacuum is created the collapse on themselves...starving the engine

 

It would seem my problem is intermittent. I drove to school this morning...every time you slam the gas the car will bog down. But when I went out and about during lunch...it revved like mad. I do feel some hesitation tho...it doesnt rev as quickly as it should under load.

My automotive instructor seems to think my accel pump isnt working right...the nozzles that mount right between the barrels...one squirts a solid stream...and the other will shoot a burst...then a drip

It's rather...frustrating

 

Sounds like the accel pump is working, but one of the passages are clogged. I would try to make sure there isn't any of that mud in the accel passages. Also, make sure that the AP is TIGHT against the throttle linkage. As soon as you move the throttle, the accel pump should move in relation to the movement of the throttle linkage, to a point.

 

You installed a Carter fuel pump. Those give 6psi. Are you using a Fuel Pressure Regulator? The Nikki wants to see max 3psi, and if your new pump is running full 6psi into the carb, it could cause problems.

Jon

 

It is a carter pump, but I dont believe its the 6psi variant. I would have liked to get the whole pump/regulator/guage setup...but lack of cash prevents such things.

I'll try checking the passages next time I get a chance...I also seem to remember seeing a checkball inside the accel pump housing...I'll examine it as well.