OK im hoping someone has had this problem and they know enough about motors to help me!!!!
ok heres the story.(cliffs at bottom)
I usually dont drive my car too hard i keep it under 5000RPMS 80% of the time. im running ls/vtec in my crx and will post the set-up if it matters later. but i was driving to work after school today and came to an intersection. i was in second gear at ~3000 rpms ( the car has been running great with NO problems at all for the time ive had it and today was no exception) right when i strainghtend out from the turn i shifted into third at ~4000rpms it bogs hella bad rioght when third gear is engaged so i shift back down to second.
so once im in second it seems to be running fine i was really sceptical about driving it still but i decided to make the trip to work which is like 6-7 more miles. when i get to work i shut it off and see if it will start back up, it struggles to start but turns over and it starts idling at ~500 rpms~!!!! and it sounds real shitty like its misfiring or something. then i give it a little rev and it blows out some black smoke from my exhaust! kinda thick. so im all kinds of bummed out and go to work, after work i really dont want to drive it, but i live like 5-7 miles away so im like screw it and drive home real easy on it under 4000 the whole time.
So now im home, and im like "i will take out the spark plugs and check them" so i get them out and they are HELLA black/carbonated!!! like really bad, something youd see out of a 2-stroke dirtbike! so i clean them and put em back in start my motor but it runs the same. i call my friend Zak and he comes over to chec it out, we crusie to his house to get his old wire/plugs from his b16 and swap them over(yes we connected them in the correct order) and it runs the same even after that. So were like screw it make a thread so here i am. it seems to be running on all four cylinders, so we are leaning towards my valves bwing fucked up.

ok to shorten it up for people who just want to know the problems in order to diagnose this:
1: exhaust is POPPY like misfiring or something.
2: when i revved it after the first shut off following the initial problewm point it poofed out black.carbonated smoke from exhaust
3:the sprak plugs were coated heavily in carbon
4:it idles at ~500rpms! pretty harshly as it increse and decreases.
5:when its running there is a heavy odor of unburnt gasoline.

im sure theres more im forgetting that ill get to later but has anyone had this problem? or know what the problem is? let me know thanks for all the help in advance..pull me through this h-t

 

Check the cam timing before you do anything. If it checks out good find a compression tester.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kendall &raquo;</TD></TR><TR><TD CLASS="quote">Check the cam timing before you do anything. If it checks out good find a compression tester.</TD></TR></TABLE>

 

no i threw a code 3...map sensor, so first im gunna trouble shoot the map sensor and hopefully that will be it! thanks though

 

My friend had the same problem on his car all the symptoms you described. I took one look at it and I knew timing was wrong. He was a of by a tooth.

 

well im pretty sure the timing wouldnt have slipped by a tooth by the time it took me to shift from second to third.

oops sorry i meant im sure it would NOT slip.


Modified by BRAD 1.8 at 9:55 AM 5/13/2005

 

I'm sorry what did you just say? Did you check the cam gear alignment at all how is the relationship with the crank timing? Is it correct?