With all the relays disconnected, especially the fuel pump relay, the car shouldn't start at all. When the the key is turned, it energizes the FP relay, which will send current to the oil pressure switch that is "open". When you crank the engine, the oil pressure rises and "closes" the switch which will then send a continues current to power the FP. Without the relay, there is no power to the oil pressure switch. That is how my 86 IROC is wired. I'm not too sure how your electrical system is wired so it may be different.

 

Hey Chevy86, love the fact ur still helping out guys on a thread that was started in 07. That's Love!!!

 

I just want to put it out there because I just fixed this issue with my car. I would not use these interchangeably. My car had the power relay and the burnoff relay swapped around, and with them connected like this it caused the D terminal on the MAF connector to be powered with 12v, ran like garbage, and threw a code 33. So there must be something different where the relay is switched internally as the problem was fixed by connecting the right relays to the right plugs.

This was a 1987 with a TPI 305, both relays were from OE parts from AC DELCO.

 

NAPA and o reilleys have the wiring plugs

 

it shouldn't matter how old a post is.every day un suspecting people buy these cars .and THEN the trouble starts.the smart ones come to TGO looking for info for their particular TPI hell. the not so smart ones go from garage to garage HOPING to find a "technician" that knows about our cars .only to find that the techs are younger than our cars and NO body knows anything.when it comes to 3rd gen Camaros we appear to be own our own

 

Well said.
If your gonna look for a mechanic, it better be an old guy. They more than likely know about old vehicles and the basics.

 

So what are the current part numbers for these relays? I'm having a fluctuating idle and car craps out at 3600. Switched the two relays and the problem went away for a little while.

Both my relays are the oval ones, part number 14089936. 1988 IROC, 305TPI.

 

napa & oreilleys both have the "pigtails" in question, however ,i must point out that they must be soldered in, NOT crimped. the idea being that theres less resistance/heat in a soldered connection than a crimped one

 

any way any of you can give me a hand with my tps voltage issue? I'm not even to sure if i have all the right relays in their location and I'm starting to think i have two different halts of wiring harnesses :S

 

Hey guys, Im getting confused with all the part numbers for the different relays getting thrown around.. For my 88 iroc, what are the correct part numbers for my fuel pump,mass air power and mass air burnoff relays? Thanks

 

Who sells relays these days that work?

 

^ I'd like to know as well

 

I buy oreilleys relays, admittadely they last only a 8 month average . but they beat the hell out of auto zone and advance that fail or are the wrong ones right out of the box. BWD -671 MAF power, and BWD -3009 burn off. I cross refrenced these from the GM relay numbers. they work for 86-89 Camaro and trans ams.with the 8th digit of the VIN being "F". or as in the TPI cars. they are our best bet considering

 

I'm assuming we can't get AC DELCO or GM relays anymore?

 

no, GM considers them obsolete

 

Well, that's sucks

 

ah, it aint all bad. the BWD select relays are pretty good. the trick is to not get fooled into being told that "MAF relays are all the same". they are NOT. and doing the research to make sure you get the correct relays for your application. we find that buying a quality MAF and relays is half the battle with a TPI car. it took quite a bit of time and effort to compile the GM part numbers for these components. IMHO its the only way to be certain

 

That's what I'm trying to figure out.. I've read this thread but in still a little confused. What are the right lets numbers for my 88, 350 TPI iroc?

 

R-671 and R-3009 are the BWD part numbers. they work on any TPI car from 86-89. I do not recommend any other brand of relays ,although you may cross reference these numbers. I find I have tried them all, and I find BWD to be the highest quality

 

Thank you sir. Those 2 number you have me are for the mass air power and burnoff relays?

 

yes, as mentioned they work on the 86-89 TPI cars

 

I went to autozone and got PO#19844 for the burnoff relay and PO#010469 for the power relay. I'm sure someones gonna say these aren't the correct part numbers and I know that they aren't the best choice but they have worked fine for me with no issues.

 

let alone the best choice, they aren't even the correct relays. but ,hey its your money

 

They are working fine for me, and for thirty bucks I'm not gonna cry and complain if I need to switch, thanks for the attitude though

 

hey, im not tryin to be a bitc$. my goal here is to help. and if the mystery relays work for you ,great. im trying to share what I have learned with others who need advice and part numbers. nothing more .or less.

 

Hey man. I just got my car out of storage and I'm tackling this relay problem.. I have a question. If the 88-89 cars had the one square relay,2 oval relays, how can the parts numbers you gave me work on 86-89?

 

I have seen different styles of them. its not what the housing looks like that matters. its what is inside that counts.and according to the GM catalog the relays from 86-89 are the same

 

According to the pictures, these telays are the flat square type. My Maf burnoff and maf power are the rounded type. They're not interchangeable.

These are what my relays look like. Fuel pump on the left, mad power in middle, maf burnoff on right

 

while it is true that none of the relays are interchangeable. you have to rule out if anyone has moved things around previously. on the bracket . you can check this with a test light. you cant rule anything out as POs may have changed things around . your best and only weapon is going to be a factory service manual for your car. that and us here on TGO

 

That;s not entirley true as the tread "say they are not all the same", but couple if the them are interchangeable depends on the year and type for example up to year 87 the Fuel Pump relay and MAF burn Off Relay got to use the same part number (GM PART#10094701) or BW R3009 where the MAF power needs BW R671 for the same year.(I have listed the correct parts numbers from different vendors in my previous post).... 1988 year still used the (GM PART#10094701) for the fuel pump relay, but has different oval shape relays for power and burn off and I believe some one said they were not interchangeable, but that I don't know

 

while its very good to post up the info you did. my point was that POs can and do some strange things. its best to not assume anything is correct until you check.

 

Here's a picture from the 1988 service manual I have. I just ordered the part #10094701 burn off relay. However, like everyone said, these cars are different. Funny that this pic shows it different from others of the same year on here.

 

[QUOTE=Johnstonxj;5959862]Here's a picture from the 1988 service manual I have. I just ordered the part #10094701 burn off relay. However, like everyone said, these cars are different. Funny that this pic shows it different from others of the same year on here.

I agree 100% I have compared the few diagrams for Fuel, MAF-Burn off and MAF-Power relays and noted different collours going to different terminals all diagrams claimed to be for 5.0 and 5.7 TPI engines

I have 87 IROC-Z28 5.0 TPI 5 SPEED F body and my MAF power relay wires are in reverese order as previoulsy posted by scubbasteve..in post 19

I compared my MAF power relay wires and they go as follows

MAF POWER RELAY
A-RED
B-BLK/WHT
C-TAN/WHT
D-GRN
D-ORG

FUEL PUMP RELAY
A-BLU
B-BLK
C-ORG
D-N/A
E-ORG

FUEL PUMP RELAY
A-TAN/WHT
B-BLK/WHT
C-GRN/WHT
D-ORG 16Gauge
E-ORG 12

Could any one who has 87 IROC-Z 28 5.0 5speed confirm Their wires and terminals especially for MAF-POWER RELAY.
PO of my IROC removed the MAF power relay and cut the wires for some reason.
I bought an after market one and reconnected it all to their corresponding collours but the she doesnt drive quite right and now am not sure seeing all the different diagrams that all my wires go to their correct terminals

 

yes I agree with you Rusty all the way my post was merely FYI only

 

[QUOTE=rusty vango;5873574]I have seen different styles of them. its not what the housing looks like that matters. its what is inside that counts.and according to the GM catalog the relays from 86-89 are the same[/QUOTE

All though that might be true, still can't use it if the connector won't or can't connect to the relay because they won't match up. Common sense here.

 

All depends on the relays you want to install, some are different, if you want the choice of which ones you need, check Hawks 3rd gen.com

 

Look at the wiring, for one, two have 5 wires and one has 4, so one of the relays is not interchangable, as for as the different types of relays you might have to change the connectors to fit the relay, as one type might not be on the market anymore. Which is what I am finding out the hard way.

 

This is the same set up I have in mine the FP relay is rectangle while the MAF relays are the other type.

 

There is a difference in the relays if your using the same for both the burn off and power it will not run right

 

Auto zone does not sell these any more

 

Hey guys, can someone explain specifically what the difference is in the MAF power and MAF burnoff relays? I've repaired some funky wiring by the previous owner and I just used off-the-shelf 12V 30A electrical relays. I had no idea they would be unsuitable, I wasn't trying to cheap-out. The MAF sensor is working (it used to throw code 33 & 36) but now the burnoff cycle is not happening (still throws code 36). If I replace them with the correct relays I'll have to source the pigtails as well since previous owner had done unmentionable things to the relays/wiring. So anyway, I'd love to save $50 - $60 and a couple of hours of work if the debate about correct v. incorrect relays is more about superstition or originality than concrete electrical specifications.
Thanks

 

I don't know why the power relay needs that resistor in '87 but not on the newer years. The MAFs are the same.

 

So, I've been going through my relays trying to fix a no start issue and, have a 4th 5 pin (only 4 wires on it) box behind the 3 relays on the firewall. It is mounted on a bracket that is directly behind the Fuel Pump Relay. Can't seen to find what it is in any of the books. Any thoughts?

 

Any ideas after replacing both relays and maf? Still getting code 36 and it idles ruff an typically goes up and down between 400-550 rpm while in drive. Thanks for any help.

 

#14089936 relay can be found as AC-Delco #15-8240

called 88-91 Corvette over drive relay.

 

elcam84 made a good research. I want to complement this with the following notes, measurements and calculations:
In my car (1986, LB9, 5lTPI) there were the following relays used:
10094701, 10078907 and 10067925. The engine is stalling, when hot; shows the SES 33 and 36.

First of all the differences between the relays are as follows:

10094701: coil-resistance 66Ohm, equal 182mAmps at 12V, 4 connectors
10078907: coil-resistance 58,4Ohm, equal 205mAmps at 12V, 5 connectors
10067925: coil-resistance 53,8Ohm (including the shunt resistor!), equal 223mAmps at 12V; additional resistor between "D" and "E" of 1kOhm, 5 connectors

10094701: Because of the 4 connector-circuit, it is the relay, which you can use ONLY for "Burn-Off" (or/-/or/bk/dkblu)
Actually you can use it also for fuel-pump, but then the diagnostic-aids won´t work (from the ALDL-connector)

10078907: This number hasn´t appeared yet in the threads, but the measurements say, you can use it either for "Burn-Off" or for "Fuel-Pump" (or/or/dkgrn-wht/blk-wht/tan-wht)

10067925: This is the relay with the resistors in it and is used as "MAF-Power" (or/dkblu/tan-wht/blk-wht/red)
What´s the reason for these resistors?
In electronic-circuits it is used to protect parts for destruction due to high voltage. So the shunt-resistors tries to protect the ECM, and the other resistor tries to protect the MAF-Sensor.
So better use this relay, if available, for the "MAF-Power"
If you are not sure or you´re never able to read the Part-Number: Take your Ohm-Meter and check the resistance of the connections. If the Ohm-Meter reads 1kOhm between "D" and "E" you have a "MAF-Power"

Furthermore there are other relays you can buy:
Nexpart offers a 14078915 as a "Fuel-Pump"
Rockauto sent me a "SH058" for "Burn-Off"
Cars & Stripes have the MAF-Power under 14-1307 and the 10094701 under 14-1306

 

So the thread means that the MAF burn of and MAF power relay are not interchangable.

On my 1988 Pontiac Trans Am GTA 350 TPI, there the same part numbers (7313 / 14089936; see picture). Bone stock.

Is this the correct configuration? I can't imagine that there are differences with the same part number...