Engine seems to “miss” st low rpm

[cbn70]

Hello all,
Just wondering what is up with my 2008 rxt x? It ran great at the start of the season last year and then seemed to develop a “miss”. I would say below 5000 rpm maybe less. Once you would wind it out it ran pretty good and would top out around 7900 rpm. I tried changing plugs for the last ride and did not change things. Old plugs seemed to be white and did not have much color to them. Is this normal? Any ideas of what the problem could be? Thought maybe the coils but all plugs look the same. Maybe leaking intercooler? But the oil looked fine and not milky. There was some oil around the base of the plugs when I changed them so that will be addressed. Sorry for the long post but trying to add all I can

 

[skiasylum]

Whitish plugs usually means the engine is running lean, all the plugs being white, possible fuel issue like contamination which has partially plugged your injectors. Could also be too much air which would be a throttle body issue.

 

[cbn70]

Thanks for the reply. Since all the plugs are the same I agree it must be something common to everything. I guess I need to check the fuel pressure to see how it is. Or start there

 

[cbn70]

Hello. It has been a bit and thought I would give an update. Threw a few parts at this to see if it would make a difference. Did new plugs, new coils. No better. New map sensor no better. Checked fuel pressure it was good. Changed filter just because and emptied the tank just in case it had water. Injectors were pulled and sent off for cleaning. Did all this and not running any better. The next step was to pull the inter cooler and do a pressure test. We did not need to do a pressure test. Water ran out of the inlet side. Maybe a half cup or so. So ordered a new one
From fizzle racing. Installed it and that was the smoking gun. This thing has never ran so well. I think the inter cooler was leaking from the day I bought it. But now the machine is running great!!! Could not have happened sooner as I put the inter cooler in the day I left for holidays. Thanks for all the help and maybe this can hopefully help someone in the future.