Cal3thousand Posted March 1, 2008 Report Share Posted March 1, 2008 Ok, I posted this in Zaitz's thread about P0103 stalling cuz I was getting some of the same symptoms, but I still need more answers/help.So here is an excerpt explaining the situation:I recently found a vacuum hose that was disconnected off of the PTC nipple that heads into my turbo inlet. I put the hose back on when I found it. I don't think that it is related, but it could be, and so I am disclosing it.The real problem is that the car stalls, but with good predictability. When coming to a stop at a light, the car wants to stumble and the RPMs die down until the car stalls completely. I can avert this by shifting into Neutral before coming to a full stop. If it starts to stumble, a light blip on the throttle will bring it back to a normal idle. (this makes me think that the IAC - Idle Air Control Valve is not completely busted, but it could be giving these problems // Idle in Neutral is smooth). It will also stall if going down a very steep hill with no throttle or if I shift into Neutral really early and the RPMs drop fast.I hooked the car up to the computer a pulled a few codes the first time (P0103 - Mass Air or Volume Circuit High Input // P0172 System too Rich (Bank1).Since the beginning of this issue, I have cleaned the MAF (mass air flow) sensor and corresponding connector with CRC component cleaner. No dice. Last night, I plugged in a new MAF sensor (OEM Bosch with the correct number) that I procured from my cousin (he owns a parts store) and the problem persists.I also cleaned out the IAC twice, each time, more crud came out, but the valve seems to move freely. I also checked the hoses that connect all of this. The only thing that I haven't done, which I will do today is remove the throttle body and clean it out with Fuel Injection-safe spray. I hope this will solve it, but I doubt it. If the IAC is at fault, it may not be fully responding, but that does not explain the code that is consistently flagged.I have been continuously checking the computer codes and the only one that persists is the P0103. I have read up on this error and it can be attributed to several factors. Soon, (hopefully tonight) I will backprobe the MAF sensor and the connector to see if there is an electrical gremlin (read: mysterious short) in the system somewhere. I will also hook the computer up to the car to check the Long Term and Short Term fuel trim to determine if there is a vacuum leak somewhere. I have checked all of the turbo piping and did not find any leaks. And since the car drives and boosts fine, I can confidently rule out a boost leak (esp since I am only getting one code P0103). The more I think about this, the more I am inclined to believe that there is an electrical fault somewhere. On second thought, I will check all of the fuses as well for signs of corrosion.Another idea, I also tried to unhook the PTC vacuum hose that I had reconnected and that seemed to do nothing different. The car also starts right up after it stalls without any problems, so my engine is fine and I am getting fuel and spark. I have replace the fuel pump 20K or so miles ago. about 2k miles ago, I replace both o2 sensors (generic bosch) and catalytic converter (Magnaflow). I also did a pnp switch replacement with a tranny flush at about the same time. No problems with any of that stuff.OK, so since then, I have cleaned the IAC again and cleaned the Throttle body out. after that, the stalling is less predictable but comes on more sudden. I know that I should check the MAF connector with multimeter and I will check the FPR vacuum line.Anywhere else I should check for this demon?EDIT: I also found that the tranny fluid was too high, I drained some off and now there is less stalling just sitting at a light, but random stalls still kill me. Link to comment Share on other sites More sharing options...
Guest Guest_DougSnow_* Posted March 1, 2008 Report Share Posted March 1, 2008 Try the Main Fuel Pump relay under the drivers side windshield wiper in the fuse box.My 94 850 was doing the same thing, especially when coasting into a stop with a low idle, and BLAM, died. This problem was intermittent for a couple of years and would drive me absolutely NUTS. Would go for months with no problems, then poof, died.Swapped about the Main Fuel Pump relay about 4-5 months ago, and absolutely NO problems sinceSee this, where I got my fixhttp://www.___.com/chat/phpB...pic.php?p=32573 Link to comment Share on other sites More sharing options...
AlvinL Posted March 1, 2008 Report Share Posted March 1, 2008 Just a thought. Is the MAF wire zip tied?http://volvospeed.com/Repair/maf_secure.php Link to comment Share on other sites More sharing options...
KlausC Posted March 1, 2008 Report Share Posted March 1, 2008 You have a 1994 854T, right? So why not use the diagnostic boxes and check all of your codes? That way you will get the Volvo specific code.It almost sounds like the torque converter lockup is malfunctioning. Link to comment Share on other sites More sharing options...
Cal3thousand Posted March 3, 2008 Author Report Share Posted March 3, 2008 The MAF connector is tied. but it seems short to be doing this.I checked the code from the diag box and got 1-2-1, MAF sensor.Why would i keep getting MAF codes for a tranny lockup or a fuel pump.... is that what you saw in your cases?Car wont run for longer than 30 seconds now I also hooked my scan tool to the car to read some parameters, i noticed that calculated load value was at 100% (weird), absolute TP was at 11-12%, MAF was reading 200 - 260 gm/s during idle (seems real high to me).Anyone know how to test the MAF connector? Link to comment Share on other sites More sharing options...
Cal3thousand Posted March 3, 2008 Author Report Share Posted March 3, 2008 Pulled some more codes:A1 - No Tranny CodesA2 233 - Idle Air Trim Exceeds Control Limits 121 - Missing or faulty MAF signalI also checked the resistance between ground and the #1 terminal on the MAF connector and I get fluctuations up to 100 Ohms, but some steadiness at .5 ohms. Does this mean that my MAF wiring is shot? and if so, how do i fix it?Rich (Bay13), how about you, got anything? Link to comment Share on other sites More sharing options...
KlausC Posted March 3, 2008 Report Share Posted March 3, 2008 If the MAF is faulty, unplugging it will allow the car to idle. Link to comment Share on other sites More sharing options...
Cal3thousand Posted March 4, 2008 Author Report Share Posted March 4, 2008 If the MAF is faulty, unplugging it will allow the car to idle.KlausC, please check out my newest thread about the MAF wiring, I think that I am onto something, with the advice of 'lookforjoe'.MAF issues Link to comment Share on other sites More sharing options...
Guest Zafi Posted March 7, 2008 Report Share Posted March 7, 2008 Try the Main Fuel Pump relay under the drivers side windshield wiper in the fuse box.My 94 850 was doing the same thing, especially when coasting into a stop with a low idle, and BLAM, died. This problem was intermittent for a couple of years and would drive me absolutely NUTS. Would go for months with no problems, then poof, died.Swapped about the Main Fuel Pump relay about 4-5 months ago, and absolutely NO problems sinceSee this, where I got my fixhttp://www.___.com/chat/phpB...pic.php?p=32573Same here. I had the stalling problem on my 94 850T wagon, typically at low speeds on the freeway, a couple of times a week on average. I was futher aggravated when the car wouldn't start when hot. Let's say I'll stop at a gas station for 5 minutes and then it would take me five attempts before I can start the engine again. And then on day I got the stalling problem at 55mph on the I405 in LA, the most congested place on Earth. Man, I was both angry and scared! No "Check Engine" light, no codes, no clue. A few days later it did it again at high speed. My Volvo repair guy had no clue what was going on. He came up with a few ideas, but none of them worked. Finally he replaced the fuel pump relay that appears to have fixed the problem. Link to comment Share on other sites More sharing options...
Cal3thousand Posted March 10, 2008 Author Report Share Posted March 10, 2008 Update:Still having the same problems here. I have a new MAF, put it in and have the same problem. When I hook it up to the scanner, the old MAF would read 208 gm/s at idle (WAY TOO HIGH) and the "new" one reads 60-100 gm/s at idle (still too high).What are the chances that I got a bunk replacement?Or does that mean that my MAF is bad and ALSO my wiring or ECU are bad? I'm so effed, and so pissed BTW, I took the time to replace the capacitors on the MAF sensor, doesn't seem any different. <---- oops I meant fuel pump relay Link to comment Share on other sites More sharing options...
Cal3thousand Posted March 14, 2008 Author Report Share Posted March 14, 2008 Final update: hopefullyI feel SOOOO dumb For all you guys that have a 1994 850 and have a MAF issue, MAKE SURE TO GET THE PART NUMBER OFF OF THE OLD MAF!If you look on FCP's site, there are 2 options:1) 93-94 & 95 Manual P/N: 0 280 217 0022) 95 AT & all 96-97 P/N: 0 280 217 107 interchanges to: 1275749Another way to determine which MAF you need: look at the screws that hold it in, if they are the type that doesn't allow you to unscrew it w/o dremel action, you need the later MAF which includes the whole housing.So I have another MAF coming in, hopefully this fixes the issue. If you don't hear back from me on this thread, it was a super success. B) Link to comment Share on other sites More sharing options...
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