| FAQ: Mass Air Flow (MAF) Sensor Issues? | |
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Abaddon Expert
Name : Scott Location : Macomb, Michigan Joined : 2010-02-24 Post Count : 4315 Merit : 185
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Tue Oct 14, 2014 10:37 am | |
| The "upper intake" gasket is the Supercharger gasket. Yes, you'll need one of those too. It does NOT come with the LIM set. You have to buy it separately. | |
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deekster_caddy Master
Name : Derek Age : 52 Location : Reading, MA Joined : 2007-01-31 Post Count : 7717 Merit : 109
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Tue Oct 14, 2014 11:20 am | |
| - KnottyEagle wrote:
- Closer inspection around the injectors today and I can see some more sludge build-up around the front three injectors and also what looks like some orange sludgy stuff. Probably old Dexcool. I know the previous owner said "and I got rid of that orange crap in there". Or, you just never changed it.
Hmmm. "and I got rid of that orange crap" - if that means he drained the radiator and filled it with green, there's probably a brown sludge in there now. The system needs a really good flush and thorough drain before you do the LIM gasket. Whatever you fill it with afterwards (I like DexCool for GM products), be consistent. The two don't mix well at all. | |
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LARRY70GS Aficionado
Name : Larry Age : 68 Location : Oakland Gardens, NY Joined : 2007-01-23 Post Count : 2193 Merit : 150
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Tue Oct 14, 2014 12:43 pm | |
| Use a vacuum gauge to diagnose a clogged exhaust. That will also show you if you have a vacuum leak. A healthy 3800 will pull a full 20" of vacuum, at idle, in Park, fully warmed up. If you raise the RPM above idle, again in Park, and run the engine at 1500 RPM, the vacuum should remain steady at 20" or more. If the vacuum drops off, you are looking at a plugged exhaust. I have an Autometer boost gauge installed. It has a vacuum portion of the gauge. _________________ 98 Riviera SC3800 All stock except gutted air box. 1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ Best MPH, 116.06 MPH, Best ET, 11.54 https://www.youtube.com/watch?v=UHCda-t_Jls https://www.youtube.com/watch?v=sfT2tEO4XcU
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jbird Fanatic
Name : Jeff Location : Cleveland area Joined : 2013-11-11 Post Count : 368 Merit : 7
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Fri Oct 17, 2014 12:44 pm | |
| Like the boost gauge, but don't have one. I will have to look into buying/borrowing a vac gauge. Maybe a trip to Harbor Freight for that thermometer too. Thanks for the responses. Jbird | |
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Abaddon Expert
Name : Scott Location : Macomb, Michigan Joined : 2010-02-24 Post Count : 4315 Merit : 185
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Fri Oct 17, 2014 1:34 pm | |
| - jbird wrote:
- Like the boost gauge, but don't have one.
I will have to look into buying/borrowing a vac gauge. Maybe a trip to Harbor Freight for that thermometer too. Thanks for the responses. Jbird Try AutoZone or something. They might have a MityVac you can rent or something. Mine has Vacuum and Pressure on it. It's great for diagnosing vacuum-related issues (and many, many other things). | |
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jbird Fanatic
Name : Jeff Location : Cleveland area Joined : 2013-11-11 Post Count : 368 Merit : 7
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Fri Oct 17, 2014 2:51 pm | |
| measured my vacuum with my Mityvac, didn't realize I could use it for that, I've only used it for bleeding brakes/clutch on my bike. it was a solid 20 at idle and rose with RPM's, seems good. one more thing ruled out. The new MAF did nothing. ruling things out slowly but surely. About time to put it away for winter & let my wallet heal. Jbird | |
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KnottyEagle Fanatic
Name : Daymon Age : 26 Location : Battle Creek, Michigan Joined : 2014-08-29 Post Count : 284 Merit : 3
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Sun Dec 14, 2014 11:11 pm | |
| Hey guys! When I first got my Riv it had just a P0102 code for a MAF. I would clean the MAF with mass air flow sensor cleaner and it would run normal for awhile and the code would come right back. I did this for awhile. Now, I have a P0171 code. I've checked all the usual things like vacuum hoses and I believe my fuel injectors to be working properly. I've also replaced the fuel and air filter.
What I did when my original MAF went bad was I went to a local junkyard and got a MAF off of an Oldsmobile Intrique thinking this will cure my problem. I think it did, but I have no idea if a non-Riviera MAF will work properly with a Riviera. The Intrique MAF was a direct plug-n-play. Took the exact same screws and everything. What I'm trying to get at is, will a non-Riviera MAF work with a Riviera? There's an obvious difference between the Intrique and Riviera in that the Riv is S/C and the Intrique is not. I didn't know if that would mess with anything. I figured that all the MAF has to do is read the air flowing threw the intake, and as long as it does that, it'll work just fine. I could be wrong though and that's why I'm asking here. | |
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matt270avian Expert
Name : Matt Age : 28 Location : Frederick, MD Joined : 2012-01-15 Post Count : 2681 Merit : 54
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Sun Dec 14, 2014 11:30 pm | |
| As long as the part numbers are the same you should be fine. GM did switch up their MAFs after '99, but I don't know if they changed the part number or not so you might want to stick with a similar/same year. | |
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KnottyEagle Fanatic
Name : Daymon Age : 26 Location : Battle Creek, Michigan Joined : 2014-08-29 Post Count : 284 Merit : 3
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Sun Dec 14, 2014 11:36 pm | |
| Just checked the year for the Intrique MAF and It's a 1998. So, I guess I can rule out the MAF as the cause for my lean condition. I hate this! It's like a mix between a scavenger hunt and connect the dots. I think of one possibility, and then it gets ruled out by something else. | |
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brutusk1 Member
Name : Brutusk Location : Bothell, Washington Joined : 2011-01-23 Post Count : 97 Merit : 13
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Sun Aug 09, 2015 2:07 am | |
| I thought I would provide the symptoms of my '96 when it had a bad MAF sensor:
1: Idle rpm control issues.
2: Transmission didn't know when to shift and sometimes shifted with a serious "bang". Would stay in 3rd when it normally would have shifted to Overdrive, and lingered longer in the lower gears as well.
3: SES engine light and periodic "Traction Control Off" messages.
4. Periodic engine hesitation/ "missing" (with P0102, MAF sensor low signal voltage) code. Mostly occurred under medium-high load conditions. Would occur each day on a particular point in my commute: 60/65 mph going slightly uphill.
If someone would like me to elaborate on this, please reply and I will.
There's a fairly involved back-story but replacing the MAF sensor (there was a P0102 code) did solve the problem.
Just finished the LIM gasket repair, installed rebuilt injectors before this problem. 1996 Riv, 214k miles.
(Edited for clarity/completeness)
Last edited by brutusk1 on Mon Aug 10, 2015 9:22 pm; edited 1 time in total | |
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AA Administrator
Name : Aaron Age : 47 Location : C-bus, Ohio Joined : 2007-01-13 Post Count : 18452 Merit : 252
| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? Sun Aug 09, 2015 12:45 pm | |
| Thanks for the report, Brutusk! This info should be helpful to the next guy with mystery MAF symptoms.
Please let us know if your Traction Control lamp returns. _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30 3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
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| Subject: Re: FAQ: Mass Air Flow (MAF) Sensor Issues? | |
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| FAQ: Mass Air Flow (MAF) Sensor Issues? | |
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