Misfire after installing Crawford Billet Power Blocks (BPB)
 

So today I installed the Crawford Billet Power Blocks. I took the car for a drive after I installed them, and everything seemed normal until I revved it to about 4k under load, and it seemed to stutter and not want to go above that. I took it home and tightened up the intake tube and looked over everything and it all seemed fine, so I took it out again and under a bit more throttle revved it to 4k. Same issue, but this time I got a blinking CEL that went away after a few seconds. I checked the code with my OBD reader and it's a cylinder 2 misfire. Any idea of the quickest way to fix this or find the problem? My guess is the o-ring on that cylinder has come undone and is causing a vacuum leak. Thanks in advance

By the way - my only other mod on the engine is the Perrin CAI and inlet tube. No tune.

I reckon the only way to check to see if the "O" ring slipped out of the groove during installation, is to take it off and check.

Now, wasn't THAT helpful .....:(


humfrz

I just took them out and the misfires stopped. No blocks for me. Rallysportdirect won't even let me return them!


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@LaertesSon did you determine whether the o-ring was out of place, etc.? Or did you just take them off, no more problem, so it's the parts fault?

Otherwise why would @Rallysportdirect even let you return an installed part that was not proven to be defective?

Misfire after installing Crawford Billet Power Blocks (BPB)
 

The o-rings were just fine. It's as simple as blocks in = misfires blocks out = runs fine. I looked and the blocks seem to have a bit of a defect, a really small dent:
http://images.tapatalk-cdn.com/15/11...4b68e5cac8.jpg
I do not think I changed one thing other than the blocks, and my misfire was solved. I'm not sure if such a small dent could actually cause a vacuum problem, but it's the only solution I can come up with.

EDIT: I don't really expect RSD to let me return them. It's just a pain because from what I can tell, the blocks were causing the issue.


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@LaertesSon interesting find. I too am curious to find out if that dent could be causing your issues. Hopefully RSD and/or Crawford can shed some light on this issue.

I am as well. I will update on what Crawford says. I think I'm out of luck with RSD. Everyone be careful with these blocks and ensure they aren't damaged before you install them.


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Crawford should replace it under warranty. if not, who'll buy it? sucks to happen this to OP. It's annoying to replace same part like 2-3 times

Misfire after installing Crawford Billet Power Blocks (BPB)
 

I'm wouldnt attempt to sell them because I spent quite a few hours getting them in and out and have nothing to show for it and I wouldnt wish that on anyone lol. Just awaiting Crawfords response now

I wouldn't think that little nick would be an issue, because the O ring should seal around it.

Did you check the blocks to make sure they were "flat", like in ..... not warped .... ??


humfrz

That's good thinking.
I just checked with a level and the level sits perfectly flat along both of the blocks. They look to be flat.

hmmmm.........I hope this doesn't insult your mechanical abilities ....... but, are you sure you installed the power blocks ....... gasket side down ..... ??


humfrz

Hah not at all. Fair question. I made sure to do that when I installed them. I triple checked that as I was installing.

Well, I'm out of "ideas".......:(

Hopefully, Crawford has a solution.

What a bummer ...... all that work ...... :cry:

Please let us know how it turns out.


humfrz