hantonyc

Engine 12a carb

Spark plug + wires and everything have 4 month

I explain, yesterday im going to a friend house cars runs great like always, so at my friend's house i stop the car, go pick him , start up the car, it stalls, i restart and it runs really bad and stalls again, restart 3-4 times .. anyway if i dont hold-up the gaz in idle the car stall and i can move it but it moves and sound really bad, BUT if i got WOT the car run normally

This morning i look-up at the plug thinking i might blew up one, they are all in great shape but there is something on the electrode , so i pick a brush and brush them out, put the back, start the car it start good and it idle good but again, it dosent sound as usual , so i put the car on ramps and find out the sound is from the catalyser , i tell to myself he might be blocked , i look in it he is empty , so it isnt it ..

i dont know what else can break-up suddenly in a simple start-up .. please help ! thx

hantonyc

note, the car was flooded 2 or 3 time with these sprak plug, could it be them being faulty because of that ? it still hard to start and when i pushback the choke the car stalls

Kentetsu

Start by seeing if you still have spark on the leading (lower) spark plugs. Sounds like you lost the leading ignition, if you are lucky....



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hantonyc

ive tried new spark plug, it didnt ran better so when it was running i disconnected 1 wire at a time and the one one that did kill the engine was the T1 wire (up left) other one even disconnected wasnt doing anything exeept if i disconnect the coil is it normal ?

so now ive got

- car on choke get a stable idle and doesnt seems that bad but it does a lot of backfire
- when i pull down the choke cars stall
- at WOT it runs great

keep in mind this problem arrived suddenly as i was starting the car at a friend's house

hantonyc

i did the compression test and both rotors are OK

speedracer_not

how did your spark plugs look? try new plugs

I had a similiar problem when installing a rebuilt engine. The start up fouled the plugs though they looked ok. When I used plugs from a tune up done 8 years ago, everything was fine.

Trailing should not make a difference. Trailing is for emissions (according to mazdatrix).

85rx7crazydriver

carb float stuck?

hantonyc

I tried new plugs, same result ... now for the car float stuck, how can i verify that? i dont know a lot about carb, thx

dmc83RX

I agree with Kentetsu. This sounds pretty much like what I experienced last month. The leading igniter suddenly went bad.

hantonyc

how do i fix that or check ? plugs/wire are new and there is fire to both coils

speedracer_not

pull the plugs, ground them, with electrodes still attached, crack over the engine, you should see a pretty blue spark. Note , healthy tanned electrodes are happy electrodes, red electrodes show fuel starvation, black oily are too rich or excessive OMP oil.

Only the leading plugs firing are required for the engine to run, trailing are for emissions.

Change your fuel filter recently???.......or distributor/rotor is cracked

only thing left to check outside of carb float is vacuum

hantonyc

ive already checked the vaccum and they are all plugged ok , what confuse me its that the car ran about 2000km this year and it was fine, then this day i did like 15km with the car and it was running fine then i stop it, 5min after, i start it again and it was doing that

wich one are the leading plugs ?? t1-t2-l1-l2 ??

hantonyc

ok nevermind i figured out L1 and l2 were leading and t1-t2 were trailing, ill check that out tomorow and ill check the distributor (altought he is almost new) fuel filter have been tested good

ill give you more news tomorows thx again

hantonyc

update ,

- I have spark to all of 4 plug wire , but then again only when i unplug the trailing #1 the car stall, otherwize it doesnt stall if it idle

- the car can idle on choke only, but if I go WOT the car runs normal , but as soon as I let the gaz off it cant reset it idle and it stalls

I said to myself im gonna take a video to show them what i do and how it runs .. but now my choke dosent stay closed so it wont start... DAMN

im starting to think there is really a problem with my carb, what you think ?



*smells v8 swap*

Hec's 79 gs

If you got spark and good compression then this may be your problem https://www.rx7club.com/1st-gen-archive-71/engine-sound-apex-seal-gone-bad-754872/ is the coasting valve, the carb gets blame a lot of times...hope this helps

hantonyc

ive read the thread and found out my coasting valve has already been blocked (a bolt in the hose that goes to the intake) but i removed it before since i didnt knew what it was

ive got able to make it run by blocking the choke lever on the carb since my cable dosnt work anymore, as soon as i pull off the choke door, car stalls again but it ran better when i gave gaz

now it smoked blue .. probably because i gave gaz with the choke door closed, so i dont mind it but it suck since i cant make a video and show really what it was doing before.. but you get the point

Hec's 79 gs

If you have to choke the carb to get it to stay running then the car has an intake leak, check by spraing some carb cleaner or wd40 around the intake gasket,carb gasket ect, ect.

hantonyc

what will it do if it have leak when i spray wd40 ?

Hec's 79 gs

My bad,when you spray the wd40 or carb cleaner by the gaskets is to help you find the leaks ,you are looking for changes in idle and smoothness. Usualy when you find a leak the engine rpm will go up and will run smooth.

hantonyc

wow now i think im in trouble, a repair the choke cable, but when i start it it runs really weirdly and it smoke blue really badly .. its getting worse everytime

Kentetsu

Sounds like you could have a blockage in the carb. Time for a rebuild?

hantonyc

thats what i am thinking time to change the carb , but instead ill swap v8 i think

Kentetsu

Yeah, that sounds much easier...

lol

hantonyc

finding 12a part in quebec is impossible, and if it isnt the problem, i dont know what would it be, and I will be stuck again with a non running car

and a full rebuild ? cost more then a swap

DivinDriver

iTrader: (15)

A carburetor rebuild will only cost you about $30.