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Im still chasing my hard cold starts and occasional stall on cold start. Recently I tried starting cold with the maf disconnected and didn't get the hard start or stall after start so I'm "assuming" I have a bad maf. It only does it on the first cold start of the day and I'm not sure if it can be contributed to the stalling while driving issues I've had recently.
Can anyone shed some light on why this replacement offered by rock auto has bosch cover on the bottom ?
Anyone know if this BSE branded one is actually a reman Bosch?
Also the Delphi that is on rock autos site for the tpi doesn't appear to have the wire element inside it like the Bosch units. Will that cause issues ?
I've read too many bad stories about after market mafs and don't want to pay for one that isn't going to help me.
Last edited by Vader; Dec 24, 2023 at 01:42 PM.
Reason: Text resize
I hope you don't mind, but the code was cleaned up to reduce the font size based on your last post. After all, Australia is a big place, worthy of big text.
That "BSE" 57854 unit does look like a reman of an original Bosch unit, but the product description does identify it as a "new" MAF with "enhancements" - whatever that is.
Their 57878 is a TFT version, eliminating the fragile hot wire in lieu of a TFT sensor. If they have done it half as well as the old Wells replacement unit, it's accurate and nearly bullet-proof.
They also list a "Walker" unit which appears to use a thermistor, but specifically mentions that it does NOT include the burn-off function. That is going to be a problem for a 1227165 ECM.
There are a few others listed which are "new" or reman units, and we know that some of the units have recently had calibration issues.
Thanks Vader. Seems like it's still a hit or miss situation with them for me. Rock auto seem to know jack about parts of your lucky enough to get an email back from them, and quite difficult and expensive to return parts to from Australia 😔
I bought a delphi maf a few months ago to replace a older bosch i thought was getting goofy.
Put it in and drove it a while with no issues. Now it has a lean band in a certain rpm range with steady throttle. I can actually feel when its about to happen, and the cel will come on until I tap the throttle a few times then it's fine.
fuel psi is steady, inj fuses are good, tps passes the sweep tests.
just need decent weather and some time off to swap to old maf and retest.
It could also be something else and a huge coincidence
The new mafs from Delphi don't send the right signal at low airflow... You can find this In other threads... They don't go low enough...confirmed with Delphi engineers
A previous owner put a Delphi in my car and I always had starting, stalling issues and occasional codes for high airflow from ecm....
Found an original Bosch unit... Now the car starts and runs sooo much better.... I had to fudge a lot of stuff to get the Delphi unit to work acceptably.... But not great.... It's still best to find a decent original....
I bought a delphi maf a few months ago to replace a older bosch i thought was getting goofy.
Put it in and drove it a while with no issues. Now it has a lean band in a certain rpm range with steady throttle. I can actually feel when its about to happen, and the cel will come on until I tap the throttle a few times then it's fine.
fuel psi is steady, inj fuses are good, tps passes the sweep tests.
just need decent weather and some time off to swap to old maf and retest.
It could also be something else and a huge coincidence
SbF, no part throwing, not my style hence trying to work out what is going on with the different mafs.
"assuming" is down to the fact that the car runs like **** with the maf connected and runs/ starts perfectly with it disconnected. No way to scan it, I've never found anyone here in Aus who can scan obd1.
In one of your comments in those links you mention BSE 57854 as their "new" maf yet it has bosch on the base of it, any idea what the deal is there ?
In one of your comments in those links you mention BSE 57854 as their "new" maf yet it has bosch on the base of it, any idea what the deal is there ?
No idea! Maybe the picture is not actual pic, but generic. I've never ordered a "new", so I don't know if they have Bosch stamped on them. The remanufactured do.
Here's a good thread to help with MAF diagnosing (I get involved at post #14):
Hmm, interesting that in the pic you posted on that thread of the ecm pinout, B12 maf sensor input, looks damaged on mine, noted in my thread in regards to my constant stalling...
Posts #56 & #63
Related you think ?
Hmm, interesting that in the pic you posted on that thread of the ecm pinout, B12 maf sensor input, looks damaged on mine, noted in my thread in regards to my constant stalling...
Posts #56 & #63
Related you think ?
Hmm, interesting that in the pic you posted on that thread of the ecm pinout, B12 maf sensor input, looks damaged on mine, noted in my thread in regards to my constant stalling...
Posts #56 & #63
Related you think ?
The mish-mash of melted wires, connectors and electronic components does not look good. It's a fire hazard and frankly could damage other electronic components. No matter what, it needs fixing before going any further.
I don't understand why you started this thread when the other thread is incomplete and you still have your major ECM/melted wiring issue. I would unplug the battery if I were you and fix this major issue first unless you want your car to burn and your garage/house with it.
That "BSE" 57854 unit does look like a reman of an original Bosch unit, but the product description does identify it as a "new" MAF with "enhancements" - whatever that is.
Their 57878 is a TFT version, eliminating the fragile hot wire in lieu of a TFT sensor. If they have done it half as well as the old Wells replacement unit, it's accurate and nearly bullet-proof.
They also list a "Walker" unit which appears to use a thermistor, but specifically mentions that it does NOT include the burn-off function. That is going to be a problem for a 1227165 ECM.
There are a few others listed which are "new" or reman units, and we know that some of the units have recently had calibration issues.
Was trying the new modelled BSE 57878 but after restart there is a Code 36. Seems like the new BSE 57878 also don't have a burn-off function (I drive a 88 GTA with 1227165 ECM).
I installed a Delphi MAF in 2021 and now it stalls. So last week I purchased a reman BSE 27854. I'll see if it works...
Was trying the new modelled BSE 57878 but after restart there is a Code 36. Seems like the new BSE 57878 also don't have a burn-off function (I drive a 88 GTA with 1227165 ECM).
I installed a Delphi MAF in 2021 and now it stalls. So last week I purchased a reman BSE 27854. I'll see if it works...
That "BSE" 57854 unit does look like a reman of an original Bosch unit, but the product description does identify it as a "new" MAF with "enhancements" - whatever that is.
Their 57878 is a TFT version, eliminating the fragile hot wire in lieu of a TFT sensor. If they have done it half as well as the old Wells replacement unit, it's accurate and nearly bullet-proof.
They also list a "Walker" unit which appears to use a thermistor, but specifically mentions that it does NOT include the burn-off function. That is going to be a problem for a 1227165 ECM.
There are a few others listed which are "new" or reman units, and we know that some of the units have recently had calibration issues.
So the autozone by me only has the 27854 (which is listed as reman, I would presume of the 57854, downside it has no warranty......before buy it, do you happen to know of the Duralast DL-6014, will cause issues with the 165 ECM? Per autozone customer service it does not have a burn off circuit, however the interior is different, and it's got a lifetime warranty.....
No burn off you will surely get a code 36. Can delete the malfunction in the tune .
...after a few months without code 36, code 36 came back.
My recommended BSE 27854 MAF fails after 200 miles. So i ordered a BSE 27854 MAF again from Rockauto. Unfortunately, it was broken from the beginning. Immediately Code 34 and 36.
It's a never ending story with remanufactured MAF... eighter I try another BSE 27854 or...
Is there nowhere in the world a new GM/Bosch MAF available? A couple years ago, www.thirdgenranch.com had new GM/Bosch MAF (unfortunately I never bought one).
It's a never ending story with remanufactured MAF... eighter I try another BSE 27854 or...
It's a never ending story... period. It's 4 decade old technology, there is no economical incentive for anyone to manufacture any new parts for our application. It's slowly dying like it should. That's the reality, it's expensive and frustrating. Some parts are low quality and hard to find.
Lately:
My reman BSE MAF threw a code 36 intermittently after barely 1000 miles an 1 year. I turned off the err code in the tune like @Tuned Performance said.
My reman Cardone Smog Pump failed after 2500 miles. I wanted to keep the car all original for value. Had to remove the smog pump as nothing was available anymore.
Brand new Koni Yellow shock leaked immediately upon installation. It was warrantied, but time consuming and frankly surprising from Koni.
etc...
That's what you signed on for... or maybe you did not know.
To let everyone know, I have solved both the issues I had outlined in this and my other related thread regarding ecm and wiring.
I fixed the melted wiring in my ecm harness and found a place here in Australia that rebuilt and repaired the damaged pins in my ecm and thankfully there wasn't much damage to the pcb. They were also able to repair and recalibrate my original bosch maf, so for over a year now I've had absolutely no problems with the car. No more misfires, no hard starting, no acceleration stumbles, no stalling, nothing. Couldn't be happier. I fear my torque converter is on its way out but that's another story.
If any one would like the details of the place I used let me know, I know shipping to Australia won't be cheap these days but if a few of you get together to send your mafs/ecms to repair it would be more worthwhile. Cheers ✌🏼
To let everyone know, I have solved both the issues I had outlined in this and my other related thread regarding ecm and wiring.
I fixed the melted wiring in my ecm harness and found a place here in Australia that rebuilt and repaired the damaged pins in my ecm and thankfully there wasn't much damage to the pcb. They were also able to repair and recalibrate my original bosch maf, so for over a year now I've had absolutely no problems with the car. No more misfires, no hard starting, no acceleration stumbles, no stalling, nothing. Couldn't be happier. I fear my torque converter is on its way out but that's another story.
If any one would like the details of the place I used let me know, I know shipping to Australia won't be cheap these days but if a few of you get together to send your mafs/ecms to repair it would be more worthwhile. Cheers ✌🏼
I sent you a PM.
I am very interested to solve my MAF problems. I'm very done with this 34 or 36 codes and buying mutiple remanufactured MAF hat I throw in the trash after a few miles.
So I am very happy to read about the place where you have a good expierience with your repaired MAF. Have the original one from 1987 and two remans and failed from BSE (also Bosch).
Are there other companies that professionally and durably recondition these parts? Does anyone know of a company or person? It's worth my money
I had error codes 34 and/or 36 with the original Bosch MAF and got these sensor back from Australia last week (for repair).
I installed it and started the car up full of hope – error code 33… I've never had an error code like that before. Now the car chokes when I take my foot off the pedal above 30 MPH.
I am very interested to solve my MAF problems. I'm very done with this 34 or 36 codes and buying mutiple remanufactured MAF hat I throw in the trash after a few miles.
So I am very happy to read about the place where you have a good expierience with your repaired MAF. Have the original one from 1987 and two remans and failed from BSE (also Bosch).
Are there other companies that professionally and durably recondition these parts? Does anyone know of a company or person? It's worth my money
I had error codes 34 and/or 36 with the original Bosch MAF and got these sensor back from Australia last week (for repair).
I installed it and started the car up full of hope – error code 33… I've never had an error code like that before. Now the car chokes when I take my foot off the pedal above 30 MPH.
Hate these MAF problems and keep looking for a solution...
Last edited by Simsalas; Jun 14, 2025 at 10:45 AM.
I had error codes 34 and/or 36 with the original Bosch MAF and got these sensor back from Australia last week (for repair).
I installed it and started the car up full of hope – error code 33… I've never had an error code like that before. Now the car chokes when I take my foot off the pedal above 30 MPH.
Hate these MAF problems and keep looking for a solution...
Update:
Tried to solve the code 33. Disconnected the battery, sprayed the MAF connector - problem still here. Next step: disconnected battery, replaced MAF power and MAF burn-off relays and sprayed the connectors. Also sprayed the TPS connector. Started the car and it runs better than ever - very smooth. No codes.
A complete mystery to me as I replaced the relays in 2024 with an older MAF with problems (BSE). That wasn't a solution at the time; still codes 34/36. However, I am satisfied (at least for now) with the remanufactured original MAF from the Australian workshop.
