Look at the intake. If you have 2 separate hoses leading from the throttle body to the air box it's S/D if you have a single hose which is bifurcated at the throttle body end and which leads to an aluminum clyinder mounted on the end of the air box it's MAF. The aluminum cylinder is the mass-air meter.
If you're expecting any real HP gains out of the K&N save your money. The gains from the less restrictive airflow are largely offset by the higher air temperatures. Thry work well on some other models where they provide a high flow cold air intake but on our generation of F150, they mostly add intake noise.
Originally posted by StrangeRanger The 95 CA trucks were allegedlly MAF. Living in CO he could have one since Ford may have lumped the "high altitude" spec tuning inwith the CARB spec,
That's made life very frustrating for me because every factory service manual lists specs for a MAF 4.9 for '95 California trucks, but I am yet to see one either. I have to presume that the '94 4.9 California trucks were exactly the same as the '95's because there are no factory manuals for a '95 California 4.9. My '95 4.9 is a California truck, it says so right on the emission label, but it's SD, and was built the end of May, 1995. If any '95 4.9's had MAF, you'd think mine would be one of them, being so far into the production run.
Well, since you guys are on this topic. Which one is more emission friendly, in that which one over the long haul is better for the emissions that are coming out of the truck? I would have thought that the MAF would be since it is more adaptive to the operation of the engine compared to the speed density that only has specific fuel curves that it follows. If there was something wrong with the engine's operation, I thought the MAF would be better able to correct that problem than the S.D. would. I was rather surprised that California has S.D. instead of MAF, but maybe I am thinking backwards on this.
PRKWUD: Glad to see ya back, how are you doing these days ????
Have Fun & Keep on Truckin'
1994 F-150 XLT Supercab, Long Box, 306 EFI, 3.55 LS, Superchip, K&N FIPK, Automatic, Royal Blue in and out, Captain Chairs. Lightly Tinted, Soft Tonneau Cover. And a few goodies ...
The MAF system may be slightly more emissions friendly on a stock engine but it's unlikely to be significant. TheS/D lookup tables actually allow a fairly wide range of variance from expected values before they puke. The biggest reason for converting to MAF in 96 was probably the requirement for OBD-II. Start modifying things and the range of allowable variance gets progressively smaller as you move closer and closer to the edge of the table.
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Fordé is a registered trademark of the Ford Motor Company