ARV: Air Recirculation Valve

MAF: Mass Air Flow

EGR: Exhaust Gas Recirculation

I may be wrong, but I don't think the air flapper valve is actually a MAF. My Bosch Electric/Electronic Systems book shows it to be an Air-flow sensor, measuring air quantity, similar to those used with L-Jetronic and Motronic fuel injection.

While an Air-mass sensor is a static unit with a heated platinum wire, used to -- what else, measure the mass of the air moving through the sensor.

There is a allen head on the side of the valve body that set WOT shift point, out to increase rpm, in to decrease it. Maybe thats your problem. (I need to tweak mine, shifts just a touch past max power point)



Joe

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Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364

Joe, I see you have an '87 300 td too. What kind of 0-60 times are you able to muster? I've been testing, but can only get it down to approximately 12.3 secs. The tranny sometimes shifts from first to second too soon and/or it'll get hung up and fail to shift up unless I let up on the throttle. In either case, I can't quite get a good acceleration figure to determine how well-tuned the engine is.

I'll investigate the WOT shiftpoint screw.

The ARV is basically a boost bleed valve to reduce boost pressure and help the trap oxidizer function (and possibly EGR). It also saps part-throttle power (significantly) and reduces MPG. With the trap gone, there's no point in having it. With the EGR and ARV disabled, the MAF serves no purpose other than to add six pounds of weight. I'm kicking myself that I didn't notice it was a straight shot through and a 3" pipe would work. I'll probably yank my MAF and put in a pipe like Zeitgeist did.

BTW - Factory spec for 0-100kmh (0-62.4mph) is 10.9 seconds (+/- 7%) with two occupants. Or roughly 10.5 seconds 0-60. The 12 range means you're close but not quite there. My car does WOT shifts around 4800rpm, maybe 5000 tops. I get 10.5-11.0 seconds at best.

I'm not familiar with the allen screw adjustment for shift points - please expound!

Dave, is that 10.9 sec figure just for the sedans, or are the wagons somewhere near that mark too? Mine's a wagon.

Oh, and the 3" conduit doesn't fit exactly. I used the flared 'female' end for the outboard (aircleaner) side and the regular conduit end for the engine side. I used 1/8" thickness high density industrial foam with an adhesive backing to fill in the remaining outside diameter. So far so good.

Casey

Whooops. The wagon spec is one second slower, 11.9 seconds to 100kmh. So your wagon is doing quite well, really.

Bummer about the pipe fitment. I guess the best solution is the Euro pipe, which would be ~$45-$50 USD at current exchange rates. If the USD ever gets stronger I might buy one when I can get it for maybe $40 or so... hmm, six pound savings...

:p

It has been 30 years since I was an electronics technician. Is that a 22k resistor with a 5% tolerance? I still remember some of the mnemonic devices like ELI the ICE man where voltage leads current in an inductive circuit, and current leads voltage in a capacitive circuit. Maybe it is an 11k resistor. I do remember wavelenghts with red being the longest and violet being the shortest before going into ultra violet and beyond.

Peter

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...my grandfather would just kill me if I get this wrong, but I read the resistor as 1k ohms with a tolerance of 5% (fourth gold band).

I saw it last night with incandescent light. Now with daylight I can see a brown band for one, a black band for zero, and the red band for two digits. Did your grandfather tell you about Violet going with the program willingly? Do you remember the mnemonic device for the formulas for sine, cosine, and tangent?

Peter

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