i have a 89 iroc with a 305 i have just got it together and cant figure out y the idle is up so high when it starts and y it cranks for about 5 to 10 seconds before it starts. i have no vacume leaks and have the tps adjusted please help thanks

 

bump need help asap

 

also after driving for about ten miniutes the check engine ligh comes on and the car wants to cut out while driving and i have to give it gas to keep it going idk what the problem is and its really annoying

 

Did you take anything apart?

 

you need to check the codes when that light comes on ..That is your first move..There are a few threads on here on how to retrieve the codes and so on..

 

everything was apart i replaced the motor and would it be a issue with having a 86 computer and a 89 harness and 86 injectors

 

I'm not sure about the combo. When I put mine back together, I bolted the EGR electrical wire between the TB and the runner, which caused a ridiculously high idle because the was a leak between the two. Just something to think about

 

yea i dont have any vacume leaks thats what i was sure it was but i couldnt for the life of me find one ..... but i also took off all the egr and emmissions crap

 

alrite i was coming home this morning and the car barely made it home its poping and bucking and will not run worth a crap the only way it will run is high rpm's at all and i cant figure it out

 

did you pull the codes from the ECM yet? We can't help you until we know what code the ECM is setting....

 

i heard there is a way to get the codes without a diagnoser thing any help on that?

 

yeah you have to get a jumper wire and jump two of the ports in the diagnostic plug...jump these two ports and turn the ignition on....the MIL will flash you the codes for example: flash....flash flash would be code 12 which you should always have another example is: flash flash flash....flash flash would be code 32

 

alrite cool thanks.

 

it came up with a code 33 and i replaced the mass airflow sensor yesterday and cleared the code and nothing different happened

 

Okay, stop right there. Code 33 is Mass Air Flow high. This doesn't mean that the MAF sensor itself is bad. In fact this code is often caused by wiring or one of the two MAF relays(burn off and power). I suggest that you find the test flowchart for code 33 and work through it.

 

i know the two relays u r talking about but i dont know what a flow chart thing is

 

Search "code33" using the search tool on this forum. There may be a tech article with the flow chart in it. A flowchart is just a series of tests that concludes with the problem solved.

Edit: Yeah, I just found the flowchart by using this search. Took me about 2 minutes to find it.

 

are both of the relays supposed to be the same part numbers

 

NO!!!, they may look the same but they are not....rockauto.com carries the proper relays they are like $7 a piece or something like that. also some cars have a 3rd MAF relay which can be found on the passenger side of the radiator....again some cars have this, others do not so if you don't have one don't panic

 

well there is three of the same ones two up by the break booster and one over by the battery and they r all the same 8 didget part numbers but the four didgets above the 8 are different

 

the 2 by the booster are MAF Power Relay, and MAF Burn Off Relay, the Power and Burn Off relays are two different part numbers. the one by the battery is also a Power Relay, it should look the same on the exterior as the other two, this relay is the same part # as the MAF Power Relay on the firewall the rock auto part numbers are as follows:

MAF Power Relay: STANDARD MOTOR PRODUCTS Part # RY109
MAF Burn Off Relay: ACDELCO Part # 158240

These are the two i used when i had a MAF issue on a pervious car

 

alrite and whitch one is witch on the firewall cause one has a black plug and the other has a gray plug

 

i am going purely on memory here and it has been a while but i believe the grey plug is Burn Off....if i am wrong someone please correct me

 

i went on rockauto and both of the parts have the same 14089936 number and the ry109 says its in a catagory for daytime running lights and the 158240 is for catagory battery charging relay

 

and would there be anyway that the 52 mm throttlebody would be causing to much air to go through the maf and throw the code 33

 

no, other than having a huge vacuum leak the TB should not cause the issue. also make sure the idle set screw has not been messed with.

I could be wrong, but I'm 99% sure the maf power and burnoff relays are interchangable. At least they are identical on my car and it runs fine...

 

yea they r the same on mine to and im gonna grab a set since they r 4 bucks a piece and hopefully thatll fix the problem

 

its been said over and over in posts regarding this code that the relays are not the same, if they were i would have said they were and saved myself the trouble of coming up with part numbers....the relays work on different voltages, now if they don't make one of the relays anymore than thats one thing....the purpose of the burn off relay is to keep the MAF clean while the car is off by literally "burning off" the dirt by heating up the wires in the MAF. can you use the same realay? yes you can but it doesn't pass the proper voltage so even though it will "burn-off" it won't get as hot as it should or too hot

 

it appears there is mixed info on this. The relays are different but looks like lots of cars still run OK with them swapped. At any rate, this thread has all the info.

https://www.thirdgen.org/forums/tpi/...nces-they.html

 

There are 2 MAF relays. The relay on the radiator support is for the passenger side cooling fan. This isn't opinion. This is fact. Most all relays on these cars are interchangeable. GM did this to keep production costs down.

Sorry guys, but just because people say things on this forum doesn't make them true. My information comes from 35 years as an auto technician and 21 year as a GM driveability specialist.

Back to what i said before this odd dispute got this thread so far off track. Follow the diagnostic flow chart. Don't just go out and buy relays. You may not need them. A vacuum leak wont cause this code. Only an electrical issue, a faulty sensor, or a faulty ECM will cause a MAF high code. Do the work. Diagnose the problem before you buy parts.

 

thanks for all the info my friend just did drop off a flowchart from alldata for the code 33 and im going through it all now and i no there isnt a vacume leak but i dont think i got em all in the right place i put the line thats coming out of the bundle into the block that has a plug into it and on the other side where its two i have one going to the intake and the other going to the bottom of the throttle body and i dk if they r right if anyone has any diagrams it would b greatly appreciated

 

ok then

 

WOW! Do I come off as a jerk or what? Sorry guys. I must have been having a bad day. Better get back on the prozac. Lol. There are alot of very well informed people on this forum and Im sorry if I offended anyone.

 

my point of the one on the radiator support was that i had a mid 86 T/A that had a third one down there, and i went to alldata to confirm it....there wasn't one relay down there it was two, and they were two differnt relays, which is why i said some cars have it and some do not, i've had cars that have a 3rd one and some that do not. i have noticed they are mostly on early TPI cars.....the purpose of a third one? i do not really know but i know on some cars it is there

 

The 85 TPI used a MAF Burnoff Module which provided power and burnoff control to the sensor. This was a one year only bad idea. Due to the rarity of this design, the module is very expensive to replace and is only offered by a few shady rebuilders(A1 Cardone). A few members have reported success at repairing this module. Apparently, the key issues are the built in relay and broken solder joints in the PC board.

From 86 through the advent of Speed Density in the 90 model year, all MAF systems on the 3rd gen were the same. Using a power relay and a burnoff relay. For more information on this system, refer to the tech articles for wiring diagrams. Use the search function by entering "MAF code 33" in the keyword box.

 

ok well i went through the flow chart and it ended up that the maf was bad so i cleared all the codes and for the first day it ran great drove it for about two hours and no problem and now i went to go to my friends house last nite and it started breaking up really bad again and pulled aonther code 33

 

Look at your wiring very closely. Check ECM grounds and all connector terminals. Try switching relays around so that your MAF is running off the fuel pump relay and visa versa. Especially swap the burn off relay for another. The burnoff relay sticking on will cause the sensor wire to overheat, destroying it. Sounds like this may be your problem.