Code 33!! I have replaced the MAFs and the relays that go with it, still getting code. I have no idea what to do now. Can someone pls help? I am not good with this stuff and its so fustrating!! Car ran great and bam, code 33. When it throws the code the car does not like to idle and runs rough. Its a 87 Iroc and I am lost..Any ideas where to look next? When u turn the key off and restart it it runs fine and the check engine light goes out, drive it a mile and easy into the throttle and the light comes on, sometimes it would take miles and miles to throw the code now its doing it within a mile or so..

 

check the maf plug for loose wires or corrosion in the pins

 

I fought this once with a car I changed a cam in, once the code hits the car goes into limp home mode. I fixed it in the eprom reprograming.

 

I replaced the pigtail when I installed the new MAF sensor..still does it.

 

The car does have a cam in it, I got the car 3 yrs ago and I drove for one summer with no issues, now its throwing code 33 everytime I try to drive it. I took it for a ride this am and went about 2 miles and the light came on and and ran rough, shut the car off for 2 mins and it starts back up just fine. I than drove it at 65mph for 30 mins and ran perfect, let off throttle to exit road and easy back into it and it throws the code..Could the TPS have anything to do with it? I have no clue how to do any sort of eprom reprogramming, I am 42 yes old and this my first injected car that I have messed with, I need help..LOL

 

have you gone through the trouble tree first ?

 

The code 33 is based off a air threshold it it spikes about the threshold number, code and check engine light and limp home mode until the ecm is reset.

 

I have not done that yet but it says to start engine for a min till the light comes on, problem is when I start the engine the light is not on untill I drive it so can I still do that test even tho the computer seems to reset itself when I shut the car off? If I go out there right now and start the car it will run fine and have no light on, the car will idle all day and run fine. Its only when I drive the car is when this happens..very fustrating.

 

I would just continue on with the flow chart. Since this is a new issue It would not be a eprom programing issue however it can be fixed that way but you might be masking a issue.

 

ok, I will, I took the computer out to just check the connections and it has a hypertech chip? prom? in it. They any good or what?

 

This is what I found when I looked up the part number...Part #127062, Thermo Master For 1987 Camaro/Firebird 350 TPI Automatic Transmission

• Premium Octane
• Cooling Fans 160 degrees (if equipped with electirc cooling fans)

 

Hypertechs made little changes to there programing off of a stock tune, if it is a piggyback unit I would take it out. usually when hypertechs go bad you get a code 51.

 

I don't even know what u mean by piggyback lol. I took the computer out of the car and took the 2 small screws out and took the panel off and looked in and theres a "chip" in there that says hypertech, I will put it back and and try to run the test u gave me.. Would a TPS have anything to do with this whole thing?

 

piggy back means the eprom is on a adapter piggy backed to the memcal. The tps will not cause a code 33. The green board on this pic is a piggyback, the other is a memcal.

 

I have the white one in the pic..thxs for all the help!

 

Try this adjust Tps to .64 and see if that helps

 

I put TPS to .64 and took it for a ride and it was great for a hr untill I slowed down going a set of railroad tracks and got back into the throttle and thew the code..dam it!!

 

Ok so I ran this test and got down to where is says prob terminal C to chassie ground and I got 5 volts so than it says MAF is faulty..Its brand new so now I am really stumped!!

 

um uh yeh, want it programed out

 

What do u mean? Talk to me..lol Something u can do??

 

yes I might be able to modify your hypertech programing or if you purchase a moates.net g1 adapter I could program a eprom to go on there back too stock programing and change the parameters of the code 33.

 

what do I need to do? Also I noticed theres a code 12 also if that has anything to do with it. Can u program something and send it to me? I would def pay, what do u need to know? Like I said I am all new to this, been a carb guy for yrs and yrs..thanks again

 

Is this what u are talking about? http://www.moates.net/g1-memory-adapter-tpi-etc.html

 

yes thats the adapter, I will send you a pm.

 

Any updates on how the car is doing ? Or is it back in storage for awhile

 

Hopefully driving it today, if not def tomorrow. Feels like I live in Seattle here, rained all week!

 

I was going to say it still sounds like a bad MAF to me. I had a similar problem, it would throw both 33 & 34 and would die while driving when the SES light came on if you let off the gas (wouldn't idle). I also changed both the relays and cleaned it with MAF cleaner and the 34 came back after a while. Changed the MAF and all has been good. Unfortunately as you must know it's a $300 part. Think I got a reman for like $260, but if yours was brand new can you take it back and exchange it?

 

Also..."33. High voltage (low vacuum) at mass air flow sensor (or MAP sensor)"...have you looked for any vacuum leaks between the MAF and the throttle body? There is a small elbow under the throttle body that can become very brittle too. See my post here for a pic: https://www.thirdgen.org/forums/tpi/...at-1988-a.html

 

I did check that vaccum line and its fairly new and looked good, but ty for the advice

 

Well thanks to the advice and alot of help from Tuned Performance I believe the code 33 is no more of a issue!

 

 

So how did you resolve the problem with the code 33? I am having this problem as well and have a Hypetech too. I also have code 41 along with code 33. Thankls for any help you can provide.

 

If you are getting a code 41 you may have a bad ecm or memcal. I resolved his issue with reprograming. I have seen lately alot of the Hypertech 127062 eprom fail. I have had some success in repairing them but its a crap shoot.

 

tunedperformanc,

Thanks for the reply back. I am going to change out the MAF and the ECM and see what happens. I will keep the board inform of my progress.

 

Go over all the wiring for the Maf look closley had a similer problem and over looked the wiring. kept replacing maf after maf and trying the toubleshoot chart when the problem was right in front of me and it also did cause the intermiten issue of the ses light

 

you should just start with the ecm trying to get rid of the 41. If the ecm does not fix it time for a new memcal double check the ecm ground behind the passenger side cylinder head for being tight.

 

tunedperformanc,

Thanks I will give that a try tomorrow. Will update you with my findings.