After purchasing the 25$Tpis book I decided to remover the screens and fins from my maf. After doing so the car threw a code for excessive air flow. I replaced the maf and the problem went away, then I decided to remove just the rear screen and the code returned. Has anyone else had these problems?

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88 camaro(orig 2.8)
355 11-1cr tfs G2 heads
lunati bracket master 230/230 .480w 1.6 roller rockers
ported plenum/slp runners and maf
stock base,58mm TB/custom chip
hooker supercomp headers/true dual 3" with 2 chamber flowmasters
ssm liftbars/subframe connectors
best time 12.81/1.62 60ft

 

I have a feeling its from your 58mm TB



put the stock one back on, then put a screenless MAF on and see what happens for kicks.

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I agree....I tried both 58 and 52MM and they threw codes 33 with MAF mods.
The ecm is seeing an unrealstic flow of air into the intake.
My Vette actually ran slower with a 58 and even a 52MM TB...58 is only good for larger cubic inch engines.
It runs harder with the stock 48MM TB.

Another problem with the larger units, is to avoid a code you have to play with the minimum air speed to TPS adjustment until you get it right.
Thats alot of trial and error to avoid codes..been there and done that.

I would suggest you put the stock TB back on, add the ported MAF and tune/set min air and TPS,etc, and go drive it around and see how it feels.
Do a back to back test with the TB's.
For your mods, a 52MM is pushing it already.58 is way too big.
If you find the 58 makes your car scream and pull harder then the stock 48 or even a 52 if you have one for testing,thats a first for me..let us know.

Good Luck and hope you get the bugs worked out.


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1986 Vette Coupe,auto, 357 L98 w/alum. heads,40 over,crane cam,3.73 Gears,The usual Mods..
Had an 86 Bird before..want to get another F car again!

 

Holy ****.... you have a 58mm TB! It was probably getting plenty of air with the screens in there... with a 58mm TB I would leave the screens for safety sake, considering you obviously don't need more air.

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1989 Chevrolet Camaro IROC-Z
L98 - 350c.i. TPI, rebuilt 700R4 auto w/shift kit, Dual catalyst Monza PaceSetter Cat-Back, SLP 1 5/8 Coated Headers, 3.23 Posi rear, Hypertech chip with 160stat, MSD 6A, Under-Drive pulleys, AFPR, K&N's, !Air Box w/ Ram Air, moddified MAF, !TB Coolant, Spohn Dual Cat SubFrame Connectors, Alarm, Keyless entry, remote starter, 92 Z28 AeroWing, Brand New Paint (6/21/01)

Future: ZZ4 TPI w/EGR, T56, 3.42 or 3.73, Spohn strut tower brace and LCA's, Accell 24# injectors

1989 Chevrolet Celebrity Eurosport <--DEAD AS OF 9/20/01
2.8 MPFI, no mods
225,000 miles and still ticking!

More info and pics on my webpage:http://go.to/iroc-z

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