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Mazda Engine General \  Hot cylinder

Hot cylinder

Mazda Engine General Mazda Engine Mazda Tech
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replies 16
following 8
 
roger26i   +1y
oh by the way the valves are adjustable on 2000's and 2200's but not on 2600's. i would check the valves or take off some pollution shit that will help alot.
speedster93b   +1y
its already gone. i removed it all back in about 2004 or 2005.

Thanks everyone for suggestions and replys. i'm going to go do more adjusting monday, and get it temped again. after thinking about it it was the first time i'd started it up since rebuilding it a few months ago, and i didn't time it yet. the timing was close, about 10 degrees TDC and i changed it to 5 degrees. talking with my dad he suggested the timing also, ha had a chevy motor once that had a similar problem and it was timing that was off... so i'll take the temp again... see where we're at.
speedster93b   +1y

oh, and i'm running little black ones. i replaced 2 or 3 of them with little tiny vacuum line with some 10-32 bolts. could have been part of the problem, but they were all on the carb.
thanks for the suggestion tho.
hex0rz   +1y
Yea, timing will play a big role in it. Let us know how it goes! I still would dig into the valvetrain if it does'nt work..
dropped90(justin)   +1y
the lifters on the 2200's are not adjustable only the 2000's




-justin
speedster93b   +1y

hmm. it was at 4 degrees btdc and running kinda rough. i advanced it to 8 and it smoothed out a bit... but the cylinders are all seeming low, and i'm running rich as heck now. its smoking a lot and smells like gas bad. hmm...
nytrdr24   +1y
w/o the full exhaust on it, your tuning efforts will only get you in the ballpark.....but i'm sure you know that. the header is equal length tubing, so that shouldn't be a factor in the #4 cyl being hotter than the rest.....now that you've changed the timing, what was the temps on the runners of the individual cyls? about the same as each other or different?

do double check the plug wires, make sure to use some di-electric grease on the connections at both the plug & distributor....also the plug gapping can make a difference, make sure they are all set @ factory specs unless you have a cam or something else that would justify running a different gap...double check that all the plugs are the same, the parts counter peeps have been known to slip up every now & then and mistakenly give you one plug hotter than the others.....

best solution on the vac caps is to go to an electrical supply house & get some heat shrink caps & shrink them on the ports, use the ones with adhesive in them, once shrunk onto the ports, they won't come back off!

if the plugs are copastetic, and no vaccum leaks, and you get the exhaust on fully & timing right & your still seeing issues on the #4 cyl, it could be like bj said a weak exhaust valve spring, no adjustment on the hydraulic lifters although it could be sticking....the only way of checkin a spring is to use a spring compression tool & measure it against a good spring to see if their rate is constant through the motion...nothing short of a pain in the arse considering you'll have to pull the head, & if going that far, it would be faster to just replace all of them & put it back together than to see if just that one spring was bad...

hope you get it fixed w/o too much agrivation!