I have an intermittent missfire with my d16z6 with Greddy turbo. Sometimes it's minor, sometimes it's pretty bad. Here's a .rec graph of a bad one. Any ideas?

 

it could be your spark plug wires. does it only miss under boost?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lazerus &raquo;</TD></TR><TR><TD CLASS="quote">it could be your spark plug wires. does it only miss under boost?</TD></TR></TABLE>
It will do it under all conditions, but it's most noticable under boost. I don't think it's ignition related. What would make the injector pulse width go ape ****?

 

what's the gap on your spark plug? Try a smaller gap.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ekb18c &raquo;</TD></TR><TR><TD CLASS="quote">what's the gap on your spark plug? Try a smaller gap.</TD></TR></TABLE>
I tried that.

 

Check your spark plug holes for water, and check for arcing through the plug boots.

how did the misfire start?

 

I had a bad problem once like that and it was my wires they looked fine but on the inside it was like they were grounded out

 

mine was backfiring while we were tuning it and having slight blips at like 3800 or so , the backfiring wa sloud like a shotgun , this was when i let off the gas thogh. and the fuel maps were fine . this was tuned on a s200, once we converted the rom over to my 4b everythign worked great.
i think the s series software has some blips to itt whether anyone wants to recognize it or not .

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr206 &raquo;</TD></TR><TR><TD CLASS="quote">mine was backfiring while we were tuning it and having slight blips at like 3800 or so , the backfiring wa sloud like a shotgun , this was when i let off the gas thogh. and the fuel maps were fine . this was tuned on a s200, once we converted the rom over to my 4b everythign worked great.
i think the s series software has some blips to itt whether anyone wants to recognize it or not . </TD></TR></TABLE>

I have to agree. Mine still has blips and it backfires. I dont really mind the backfiring its the blips that are just so ****** annoying. Its only in one area 300 mm/hg. I am using S100b.

 

see mine alwyas did it on jeffs s series, he can never find anything wrong with the maps, thne we convert it back to my 4b and all the probs are gone.

 

Ok, mine is doing the same... I have changed the Gap on the plugs to 30, changed the Rotor,Cap and wires. I get a blip while idling.. I know you guys love the Hondata but it appears that there are known issues that I can't get a response on from the Hondata forum. For instance the alternator voltage issue, where you have to cut the Alt-C wire in order to get the alternator to stay on... If possible hopefully this thread can get some answers.. Thanks..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lazerus &raquo;</TD></TR><TR><TD CLASS="quote">

how did the misfire start?</TD></TR></TABLE>
It became alot more noticeable after getting rid of the stock exhaust for a 2.5 inch system. It also has a miss at idle. Compression and leakdown tests good. Ive tried all ignition parts with known good pieces.