i just bought an 85 gs and i can get it to run but it wont rev over 3000 rpm

i checked the spark plugs and the leading plug in the first rotor is like new where as the other three are somewhat fouled

it has a spark but seems to not be igniting anything

can annyone help me

Have you replaced the plugs?

the guy i bought it from said he had replaced them and it did not help the problem (of course i know that means nothing)

i also failedto mention that the oil had what semmed like a excess amount of gas in it before i changed it

The oil in my 82 always smells pretty gassy compared to other vehicles I have had. I suggest you go with the easy stuff first; change the plugs and wires and go from there. I don't know if all 1st gens use a distributor, but if yours does buy a new cap and rotor as well.

Also check for any vacume leaks.

i have aleady bught a cap rotor and wires i justtook he uys word for it that the plugs were new cnsidering they cost more than your avrege spark plug) i guess ill hve to break out and buy them



also should i try an atf treatment before changing them

put new spark plugs and a fule filter on it today and that did not help at all

Is it getting fuel? Double check spark, then fuel.... you may have a carb issue.

ok, lets see. when you rev it, does it reach 3000rpm pretty quick, or does it get there slowly?? when the engine is running, does it shake like a mofo and feels like it wants too rip the supports off?? hows the timing??



You might want to do a compression test. Check the FAQ's there should be a how-to there.

and if you dont already have one get a haynes manual.

it takes a while to get to 3k, does not shake.

i have already checked the timing and have a haynes, which does not seem to cover this type of problem

also, i think i forgot to mention that blows smoke

(unburned fule) untill it starts to warm up

check the compression, give it he atf treatment and recheck compression.

I had a question here but i found it to be stupid, cause my lack of sleep. :sarcasm:

Maybe the cat is bad?? That happened to a van at work. Wouldn't go over 35mph and it had a bad cat. Just a thought.





Mike

i just did an atf treatment and that didnt help either



the cat had already been replased with a strait pipe when i had bought it

it does have an exaust leak but i dont think that is the prob

i have not done a compression test on it yet because my mayns says i cant use a regular compression tester on it and the speical tester is around $500 used

the nearest dealer is an 45 min. tow from where i live

is there anny way i can check it at home?

read here for a somewhat of a compression test. it wont give you accurate numbers but it will tell you if theres no compression.



https://www.nopistons.com/cgi-bin....;t=2551

thanks everyone for your help i think it might be a carb prob.

what do you think

im waiting for my "7 fund" to build up so i can replace it. does annyone know of a good place to get a carb or rebuild kit fairly cheap

thanks and ill keep you posted

any autoparts store will have a rebuild kit for the nikki. If you want to spend the money, send your carb (or a spare) to Paul Yaw with $300. He will soup that thing up like you would not believe, and still maintain street driveability.



Good Luck,

Try looking in a junk-yard for a carb. talk to the guy at the junk-yard ask him if the car ran when it came in. It could have just been in an accident and the carb. would be OK thake it off. It's even pre ajusted!- Devon

I know you said the cat was removed, but that was the problem with my 84 GS. It was running fine then one day I went to start it and it ran like crap. i looked under the car and the cat was glowing red. cleaned the cat out and no more problem

would a clogged cat also cause it to backfire?

I'm pretty sure its a carb issue. Does it also depend on how much throttle you give? If you floor it at 2k it will stumble early; if you slowly wind it out it might go all the way to 5 or 6k before it bogs.



Mine started doing this yesterday. I'm pretty sure your choke butterflies are not fully releasing and its making the car run way too rich. I'll work on mine tonite and get back here if I find out anything.

well I was messing around with it for awhile tonite, it seems to rev better with the filter and box removed so I think its either the secondaries or something else, not sure yet.