clindayag1

i live in california, 626 area close to the 60 fwy. im looking for a mechanic that knows his 240zs. i just cant seem to get my car running right. i would prefer to have it running with my original l24 but if its in bad condition and needs a rebuild, i have a l28 to swap in. whatever costs less because im just a college student.

yeah its a 240z. i redlined the motor when i was racing. the plugs were black, i guess its burnt up oil. #3 plug was oily and #1 was the only normal one. havent checked the carbs or fuel pressure yet. coolant looks good. oil looks dirty and i just changed the oil last month (possible suspect?). vac lines are good. hmmm its kinda hard to explain in words...i guess you can say it miss fires. like at idle, when i rev, it sounds like a sport bike. but when i drive it, it sounds like a cheap dirt bike with no power.

yeah the timing was waaaaay off. i got the timing down now. the vacuum advance plate is good. but it still struggles when i drive it. could it be carb or fuel related?

i took the plate off to check out the small bearings and i found that the weights on the shaft were rusted and wouldn't move. so i went to the junkyard and got a distributor that was in a better condition than mine. swapped out the rusted one and put in the newer one. i also put in new points and condenser. when i started the car, it idled really rough and when i tried to give it some gas it would stall. :disappoin

post deleted

the plugs were fouled so i replaced them. there is a slight improvement but still low on power. its starts to stumble and lose power at anything over 3k rpm.

i really think it could have something to do with the ignition although i just changed my points and condenser and spark plugs like 2 months ago. maybe something happened to the timing? also, what do you mean by sparking a plug wire to ground?

It still runs smooth and revs fine at idle but when trying to drive it down the street, it starts to struggle and sounds really rough.

i usually drive around the neighborhood and my max speed is usually 40mph. one day one on my friends pulled up on the side of me at the stop light and started revving. i never pushed my z hard before so i was curious how it would do. so we just raced to the next light. my max speed was like 55mph. after that i noticed the car started to pull weak and the exhaust sounded like a low pitched rattle. i was goin like 25 all the way home because i couldn't get it to go any higher. when i got home i checked everything and it looked ok. but i noticed the plugs were a black, some of them were a little oily and only the #1 plug was normal. any advice?

i went to adjust the mixture of the front carb. then when i was about to turn the nut, black oil was all over my fingertips. i check the rear carb for leakage and there was none. where did this oil come from? and how can i fix it?

so far i've cleaned the float bowls, and the screens that go to the bowls, replaced the fuel filter, and blew air through the fuel lines. unfortunately there has been no improvement. but after sitting in the garage for a couple of weeks and i decided to take it for a spin and see how it does. when i drove it it ran good and the problems went away. how could that be?

so far i've checked everything you guys told me to check. i changed the plugs which were sooty. everything else looks good. but when i checked the floats i noticed that the rear float had a significant amount of rust and sediment settled at the bottom. so i cleaned out the float bowls and readjusted the floats. then i took it for a test drive. when driving its starts to struggle after 3k rpm and if i keep it there, the rpms start to decrease even though i try to give it more gas. i also noticed that you can really hear the carbs suck in a lot of air. i think its sucking in too much air because when i try to floor the accelerator it would stall if i didn't let go. so i guess i'm not getting enough fuel. i think the rust has something to do with it. i'm going to get a new fuel filter and see what that does. besides the fuel tank, is there anything else that i can clean out that might have rust in it?

i haven't set the floats. i don't know how to do that. i assume they are good because the car ran good a month ago. i changed the cap, rotor, wires, points and condenser. that gave it a little bit of improvement. the vacuum advance is good. all thats left is the choke issue and fuel hose issue. so how do i check if the choke is running properly? i'm going to check the fuel hoses and let you guys know results. thanks for the help, i really appereciate it;)

yeah they are all black and sooty except #3 which was kind of oily. i figured they were too rich when turning them 3 full turns down. also i noticed that my oil is pretty dirty and i just changed it a few days ago. could that have something to do with it?

yeah i figured they were a bit lean. now im 3 turns down and it runs better now. but now, when i drive i cant go past 3k rpm. if i try, i starts to rumble like its goin to stall, especially when i try to floor it.