1990 240sx coupe auto 2400

[wenrick6000]

well she runs a bit rough just rtyin to get it runnin good well you put a piece of paper in front of muffler and rev it up just a little it soakes the paper in unburnt gas and oil, now ive been told my bottum end rings are toast but no shes still got the power i think i need to figure out the timing on it and upgrtade from 7mm plug wires to 10mm and use 5w 30 instead of 10w 30 i have a sticky note to use 5 w 30 in owners manual got bosh plat 4 prong plugs my cat is plugged my mannual dosnt tell me my timming seq any sug?? please help if it dies on me im up @#$% creek and loose my job nothing elese to drive

[navysnail]

are you sure its unburned gas and oil, assuming you have a cat those both would be reacted. i suppose it could happen, but its probobly more likely that it is water condensation with carbon in it so it appears black. smell it to see if it smells like fuel.

timing is supposed to be 20 BTDC

[wenrick6000]

well thanks for the info i was tweekin the timing earlyer and just crancked it all the way to the left seemed to idle high at first then settled down seems to burn a little hotter burnt tip on new muffler but stoped the carbon or unburnt stuff from collecting all over my back bumber i know it might not be good the way i did timeing but it dosnt sound like it runs higher and dosnt idle higher infact idels lower than normal but ill get a timming light and adjust it to the spec you gave me wut do you think of the plug wires should i go to 10mm and now my alt when out on me today say would you know a cheap place to get a new alt for a 1990 240sx coupe 2400 2.4l auto yes auto lol would you happin to know what motoer my car has somone told me it was a ka25 or somthin i know it wasnt what he said but i dont know either

[ricebike]

holy run-on sentence, batman!

timing is supposed to be 20 BTDC

umm, he's got the 1990 SOHC KA24e engine

soo

timing should be 15 +/-2 BTDC @ norm idle speed of 750 +/- 50 RPMs

get rid of the bosch platinum +4s... they suxorz... if u wanna stay platinums, go w/ bosch single platinum instead. or just revert back to copper plugs: bosch super or ngk v-powers are good choices.

daily driver? stay w/ 8mm, but if u got enuff $ to splurge on bling bling 10 mm wires, then go 4 it, i guess <shrugs>

[Alfador]

haha, you beat me to it. I keep the service manual right next to this comp too... But yeah thats it. Then again, I have a 90 that idles at about 850-900 most of the time and I get complimented on how low that is (most KA24Es I've seen idle at 1k or higher). I did recently get it back down to 750 spot on when I replaced a bunch of stuff though.

[ricebike]

u betta get a timing light & set it correctly!

oh, as for the oil... 10w30 is fine... heck u can go 10w40 or 20w50 if your rings are "toast" (u can verify that easily w/ a compression/leakdown test...)

ps: plugged cat? how did u check on that? if u r by autozone, u can rent a vaccuum gauge & test, i can't recall how u do it for a plugged egr/cat rite now... it's late.

[wenrick6000]

as for finding out i had a new muffler put on we cut the pipe right up to the cat i can see the build up pretty thick and i can wash my white car if i drive it to work and back for 2 days then my back bumper is black with carbon or unburnt gas im thinkin i might have got that prb but well i held a piece of paper by muffler reved once or twice just soaked the piece of paper well tweeked the timming higher and het hardly no splatter what do you all think that could be besides rings i dont think its rings ?