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ZUKIWORLD Discussion Forum => Technical Discussion - Beginner / Repair => Topic started by: schaney on March 23, 2011, 08:27:12 AM

Title: Cracked manifold = Crappy mileage
Post by: schaney on March 23, 2011, 08:27:12 AM
Title: Re: Cracked manifold = Crappy mileage
Post by: wildgoody on March 23, 2011, 08:41:39 AM: Good job, I really would not have thought a crack like that could
waste so much gas and kill fuel mileage the way it did

Wild
Title: Re: Cracked manifold = Crappy mileage
Post by: fordguy79 on March 23, 2011, 11:40:20 AM: so that why i suck gas
Title: Re: Cracked manifold = Crappy mileage
Post by: schaney on March 23, 2011, 01:11:00 PM: Yes, I wouldn't have thought it would make that much difference either. Figure I'm saving $12 per tank now!
Title: Re: Cracked manifold = Crappy mileage
Post by: GlockGuy40Cal. on March 23, 2011, 02:22:19 PM: hey man thanks i just bought a sami. and the sensor light came on the dash and i noticed the manifold is also cracked and i too get crappy mpg. i am going to fix that. thanks so much im new to the suzuki family, about 24 hours new. ??? i still got lots to learn but this is going to help me out alot
Title: Re: Cracked manifold = Crappy mileage
Post by: jeff1997 on March 23, 2011, 06:13:02 PM: I know this is about a FORD but hear me out. My 98 Expedition has a warped and cracked exhaust manifold. I was told do not replace it with another casting but go headers. I get a set of headers and am hoping to put them on this week. My mileage is about 11mpg so I hope this will help. The leak is getting worse as is the MPG. I also would never had thought that would make such a difference. BTW my CEL is also on for that very reason. At least on the Suzuki's you only have to replace 1 manifold. :laugh:
Title: Re: Cracked manifold = Crappy mileage
Post by: GlockGuy40Cal. on March 23, 2011, 10:29:39 PM: where did you get that new manifold?
Title: Re: Cracked manifold = Crappy mileage
Post by: schaney on March 24, 2011, 07:48:35 AM: SouthwestSuzuki.com is where I purchased it, had the best price by a long shot.

Yes, I'm some what concerned that the stock manifold will crack again someday. The problem with the 16V headers available is the CalMini ones are not smog legal and the Doug Thorley have some design element that concern me. They move the O2 sensor about twice as far downstream from the stock location and have it measuring only two cylinders not in the main collector.

Also note, my CEL never came on.

GlockGuy40cal, does your Sami have carb or efi? If it has a carb and no O2 sensor, I'm assuming a cracked exhaust manifold would have no impact on mileage. On a Sidekick with efi and an O2 sensor, extra air is a problem.
Title: Re: Cracked manifold = Crappy mileage
Post by: djlantis57 on March 25, 2011, 09:38:24 AM
Title: Re: Cracked manifold = Crappy mileage
Post by: schaney on March 26, 2011, 08:48:16 AM: I wish it would have been that easy, could of saved my self about $300 and 4 hours of work ...
Title: Re: Cracked manifold = Crappy mileage
Post by: fuzzy1 on March 26, 2011, 02:01:48 PM: Quote from: schaney on March 24, 2011, 07:48:35 AM
Yes, I'm some what concerned that the stock manifold will crack again someday.

This shouldn't be a problem, as the 16v manifold was redesigned in '94 ('95?) both to correct the cracking issue & it was tuned. It's relatively uncommon for the later version to have cracking issues &, unlike any aftermarket header that I know of, it's a tuned manifold.
I haven't done a header for that very reason. I can't see spending the bucks on one when the stocker is tuned & likely performs better. ;)
Title: Re: Cracked manifold = Crappy mileage
Post by: schaney on March 27, 2011, 08:41:55 AM: Well that is great news!