jackjtr
Member
I recently swapped a 1Z out of a 97 Passat into my EuroVan. This required me to lengthen a few sensor harnesses, including the MAF sensor.
Everything is well except one code that I'm getting, which is implausible signal from the MAF. Here is what's going on:
Start engine, MAF (specified) reads 250mg/str, actual reads 29.9mg/str. If I give some slight throttle, the actual will drop down to about 10, and then return to 29.9 at idle. If I give it enough throttle to reach around 2500rpm, the reading will drop very low, then stick to 548.6mg/str, which remains unchanged. After this happens, RPM will have no effect on the actual reading until the engine is restarted. Reading never goes above 29.9 until it sticks at 548.6.
I'm 99% sure I have no boost or vacuum leaks, but I assume I would just see a slightly lower number, which would rise in relation to RPM, not fall slightly.
I triple checked my wiring. Everything is fine. From my understanding, there is only one signal wire. I am getting 5v and 12v to the proper pins. Ground pins are also fine.
Is there anything else that could be causing this? Injection pump timing is a fair bit off, but I assume that wouldn't have an effect on my intake air mass (at least this major). Engine starts and runs well both cold and warm.
Are you supposed to be able to see the "hot wire" inside the sensor housing? I can't seem to find one in there. I had a cluster short out on me through the "sender ground" before I installed the B4 cluster. I wonder if the wire got hot and burned up. That's my theory, unless of course I burnt up some segments in the ECU, which I find unlikely due to the fact that everything else is working properly.
I have a new MAF on order already. Just wondering if there is anything else to check out.
Thanks.
Everything is well except one code that I'm getting, which is implausible signal from the MAF. Here is what's going on:
Start engine, MAF (specified) reads 250mg/str, actual reads 29.9mg/str. If I give some slight throttle, the actual will drop down to about 10, and then return to 29.9 at idle. If I give it enough throttle to reach around 2500rpm, the reading will drop very low, then stick to 548.6mg/str, which remains unchanged. After this happens, RPM will have no effect on the actual reading until the engine is restarted. Reading never goes above 29.9 until it sticks at 548.6.
I'm 99% sure I have no boost or vacuum leaks, but I assume I would just see a slightly lower number, which would rise in relation to RPM, not fall slightly.
I triple checked my wiring. Everything is fine. From my understanding, there is only one signal wire. I am getting 5v and 12v to the proper pins. Ground pins are also fine.
Is there anything else that could be causing this? Injection pump timing is a fair bit off, but I assume that wouldn't have an effect on my intake air mass (at least this major). Engine starts and runs well both cold and warm.
Are you supposed to be able to see the "hot wire" inside the sensor housing? I can't seem to find one in there. I had a cluster short out on me through the "sender ground" before I installed the B4 cluster. I wonder if the wire got hot and burned up. That's my theory, unless of course I burnt up some segments in the ECU, which I find unlikely due to the fact that everything else is working properly.
I have a new MAF on order already. Just wondering if there is anything else to check out.
Thanks.