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DaveRad · 04-28-2023, 03:24 PM

Hello everyone, I’ve made a few threads about this, and I just can’t seem to chase down my vacuum leak. Some quick details

1998 automatic Boxster, 55k miles, completely stock

Current symptoms: rough/bouncing idle on startup that evens out at about 800rpm, and a noticeable torque decrease.

I’ve replaced the AOS and MAF. After I replaced the MAF, the codes went away for almost 2 weeks and then came back. The codes i had before the maf replacement were 1128 and 1130, and right before I replaced the maf, p0102. Now that I’ve replaced the maf, I have codes p1124 and p1126, with p0102 occasionally. I have had the engine smoked by a shop, and they came back with nothing.

I tried to find a vacuum leak myself by using a small propane tank and spraying a tiny bit is various places to test for a leak and it came back with nothing. What should I do next? I have a cheap OBD scanner, it can read MAF air flow but it can’t read voltage of the MAF. It can also read short term and long term fuel trims. I’m truly at my wits end, I appreciate any help.

04-28-2023, 03:24 PM	#1
DaveRad Registered User Join Date: Aug 2022 Location: Minnesota Posts: 28	Chasing my vacuum leak Hello everyone, I’ve made a few threads about this, and I just can’t seem to chase down my vacuum leak. Some quick details 1998 automatic Boxster, 55k miles, completely stock Current symptoms: rough/bouncing idle on startup that evens out at about 800rpm, and a noticeable torque decrease. I’ve replaced the AOS and MAF. After I replaced the MAF, the codes went away for almost 2 weeks and then came back. The codes i had before the maf replacement were 1128 and 1130, and right before I replaced the maf, p0102. Now that I’ve replaced the maf, I have codes p1124 and p1126, with p0102 occasionally. I have had the engine smoked by a shop, and they came back with nothing. I tried to find a vacuum leak myself by using a small propane tank and spraying a tiny bit is various places to test for a leak and it came back with nothing. What should I do next? I have a cheap OBD scanner, it can read MAF air flow but it can’t read voltage of the MAF. It can also read short term and long term fuel trims. I’m truly at my wits end, I appreciate any help.