Anbody have this problem before, when my car is cold it wants to hesitate and throws the 33 code, unless I keep car out of overdrive to keep rpms above 2000. If it is warmer out, above 50, it won't do this, runs good. I can't seem to find anything else wrong.

 

Any mods to the car?

And whats your TPS set at?

 

Yes, I have many mods its a 383, trickflow heads, comp cam, filter boxes cut, afpr, edelbrock tes headers, flowmaster catback, hypertech, and a few others I'm sure I forgot. Tps is set right now at .58, according to scantool, been moving it around, don't seem to be any difference.?

 

one other thing, the maf has already been replaced with a wells maf, and fuel pressure is at 43psi right now.

 

Check for vacuum leaks. Any leak in the intake that occurs after the mass air meter will set a code 33.

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L98, 3.27 9-bolt, Hooker shorty headers, custom 2.5inch Y-pipe, no cat, 3inch 2chamber flowmaster, JET AFPR, Ported MAF, Best ET: 13.86 @100mph. 1.99 60'
17 inch ROH "ZS" wheels. 17x8.5(front) and 17x9.5 (rear). Firestone Firehawk SZ50s. 245/45/zr17s and 275/40/zr17s. T56

On the way... Radar Blue 89 Formula, T56, Ram Jet 430, Ram Air, 17inch ROHs.

 

Its a combination of the cubes and the cam you probably have in there. There is a diagnostic part for the MAF that compares the read value to the reference table, and its having a conflict there. The 89 is better than earlier chips, so I'm a bit surprised you are having that problem. It being related to temperature is why I am guessing its the chip and not something like a relay or wiring.

 

Madmax, let me add a little more to my story. This engine has been in the car for 4 years, and I haven't had this problem until the end of last summer, so it seems to me to be something misadjusted, or starting to break, odd. Anything else you think I could try? Thanks

 

change the maf power and maf burnoff relays.

 

Well that sorta rules that out for the most part.
Make sure theres no bent pins at the MAF and the connector isnt worn out. And check the vacuum lines, that sometimes causes it.

 

I've already replaced the maf burnoff, had error last year, guess I could try the power relay. I give it a shot.