MAF problem on an '87 EFI
09-30-2006, 03:54 PM
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MAF problem on an '87 EFI
So the Runner has been giving me a little trouble lately. As of late, she'll start just fine, but after she gets warmed up and I turn off the engine, she won;t start back up. This went on for a few days before I took her out today, and after I parked she wouldn't start back up. I *think* we traced the problem to the MAF. When I unplug the connector to the sensor, she'll start and ide, then sputter and die when it starts looking for the signal that it's not getting. Plugging the connector back won't even get me started, just a sputter at first, and as of now just cranking.
There isn't a replacement unit in Fort Collins, anywhere. And even then if I had one ordered it would be like $130.
So does anyone have any suggestions?
Right now I'm thinking I want to try to find one at a junk yard or craigslist. But my Runner only has 170k on it, so I'd be hesitant about getting another with even higher mileage. But this leads me to my next question. If I'm going to go through the trouble of tracking one down, is there a MAF from any other Toyota, (or any car for that matter,) with maybe a larger bore or better design that I can throw in there? Splicing a new plug wouldn't be a problem.
Thanks!
There isn't a replacement unit in Fort Collins, anywhere. And even then if I had one ordered it would be like $130.
So does anyone have any suggestions?
Right now I'm thinking I want to try to find one at a junk yard or craigslist. But my Runner only has 170k on it, so I'd be hesitant about getting another with even higher mileage. But this leads me to my next question. If I'm going to go through the trouble of tracking one down, is there a MAF from any other Toyota, (or any car for that matter,) with maybe a larger bore or better design that I can throw in there? Splicing a new plug wouldn't be a problem.Thanks!
10-02-2006, 09:56 AM
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My fault, its a 22re. 170k on the clock. All of my fuses are good. And I know its getting fuel, like I said before it will start w/o the MAF plugged in and I can smell the fuel in the exhaust.
We're going to try to track down a used MAF right now, just to see if thats the problem. If it isn't, I'm not sure where to look next.
We're going to try to track down a used MAF right now, just to see if thats the problem. If it isn't, I'm not sure where to look next.
10-02-2006, 02:07 PM
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Update:
We tossed ina *used* MAF and the problem hasn't gone away. But we did get it started for about 5 minutes, and then once it warmed up it died and the problem is the same as it has been the last few days. So for kicks we tossed in a new water temp sensor, and that didn't change anything. The one thing we do know is good is the throttle sensor
We're going to try and track down a MAF off of a working 22re, but in the mean time does anyone have any ideas?
We tossed ina *used* MAF and the problem hasn't gone away. But we did get it started for about 5 minutes, and then once it warmed up it died and the problem is the same as it has been the last few days. So for kicks we tossed in a new water temp sensor, and that didn't change anything. The one thing we do know is good is the throttle sensor
We're going to try and track down a MAF off of a working 22re, but in the mean time does anyone have any ideas?
10-02-2006, 05:55 PM
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That really sounds like the symptoms of a bad signal generator.
The signal generator is a sensor that’s inside the dist. which controls spark and fuel injector pulsations. To check it, disconnect the plug (it’s green on my 84) leading out of the distributor and ohm it out (distributor side, not the one leading to the ignitor). It should be somewhere between 140-180 ohms.
Those little bastards like to ohm out fine when cold, but as soon as the motor warms up they go haywire. It may be a good idea to get the truck running until it dies and then test it.
The signal generator is a sensor that’s inside the dist. which controls spark and fuel injector pulsations. To check it, disconnect the plug (it’s green on my 84) leading out of the distributor and ohm it out (distributor side, not the one leading to the ignitor). It should be somewhere between 140-180 ohms.
Those little bastards like to ohm out fine when cold, but as soon as the motor warms up they go haywire. It may be a good idea to get the truck running until it dies and then test it.
10-04-2006, 07:16 PM
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Ok, I'll give that a shot, thanks! The truck won't start at all now, is that going to be a problem. Also, I havn't torn apart the distributor on a 22re before, is that sensor somethign that can be replaced? Or is it goign to require a whole new distro, assuking its bad?
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10-05-2006, 05:58 AM
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That really sounds like the symptoms of a bad signal generator.
The signal generator is a sensor that’s inside the dist. which controls spark and fuel injector pulsations. To check it, disconnect the plug (it’s green on my 84) leading out of the distributor and ohm it out (distributor side, not the one leading to the ignitor). It should be somewhere between 140-180 ohms.
Those little bastards like to ohm out fine when cold, but as soon as the motor warms up they go haywire. It may be a good idea to get the truck running until it dies and then test it.
The signal generator is a sensor that’s inside the dist. which controls spark and fuel injector pulsations. To check it, disconnect the plug (it’s green on my 84) leading out of the distributor and ohm it out (distributor side, not the one leading to the ignitor). It should be somewhere between 140-180 ohms.
Those little bastards like to ohm out fine when cold, but as soon as the motor warms up they go haywire. It may be a good idea to get the truck running until it dies and then test it.
The AFM also routes control for the fuel pump... Have fuel pressure?
10-05-2006, 10:37 AM
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I am getting spark for sure. It just sat for a day w/o anyone touching it, and it started up, but wouldnt idle. (with the AFM plugged in.) I let it die after about 2 or 3 minutes, and we're back to the way it was. With the AFM unplugged, it will turn and chug for a second, but to get it to rev up I have to keep the ignition held down.
I didn't know that the AFM was involved in fuel pressure, so I'll go look at that right now. I'm just getting all kinds of turned around with this. Why it would start after a day, then die and not start again, but almost start with the AFM unplugged.
I didn't know that the AFM was involved in fuel pressure, so I'll go look at that right now. I'm just getting all kinds of turned around with this. Why it would start after a day, then die and not start again, but almost start with the AFM unplugged.
Last edited by reezie; 10-05-2006 at 10:39 AM.
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