[2001 V70 T5] Loud inconsistent popping coming from intake manifold area after removing ETM.

Passerine · Post by **Passerine** » 11 Mar 2024, 18:27

Hello,

I recently removed my ETM because I am trying to diagnose a lean condition in my Volvo. The ETM was replaced with a Xemo model by the previous owner a few years ago. When I removed the air pipe going to the ETM (#31101214) where it connects to my ETM crumbled apart. I was hoping this was the cause of my issue and I ordered a new pipe and replaced the ETM's gasket. I put it all back together and my volvo is still having the same idling issues except now it also pops very loudly occasionally. Sounds like it might be predetonation but it is hard to tell.

VIDA is giving me these codes.

ECM-3503 Misfiring
ECM-3533 Misfire cylinder 3
ECM-6806 Turbocharger (TC) control system flow fault - Flow too high

If anyone can help me that would be greatly appreciated, I've been working on this thing on and off for a few months and would love to actually drive it haha. I've replaced every vacuum hose except the brake booster hose, which looks brand new and was supposedly replaced by previous owner. One of the first things I did was replace Ignition Coil #3 as that was throwing a code (I read that with a reader I have before I got VIDA/DICE) and that code has not come back.

Post by **MoVolvos** » 11 Mar 2024, 18:43

.
Perhaps it's a similar issue? Hope it does not lead you down a rabbit hole.
.
2002 V70 XC - P0304, P0204, P0236, P0237
viewtopic.php?p=642607#p642607
.

Passerine · Post by **Passerine** » 12 Mar 2024, 04:06

MoVolvos wrote: 11 Mar 2024, 18:43 .
Perhaps it's a similar issue? Hope it does not lead you down a rabbit hole.
.
2002 V70 XC - P0304, P0204, P0236, P0237
viewtopic.php?p=642607#p642607
.

I'll try that this weekend thank you!

dikidera · Post by **dikidera** » 12 Mar 2024, 15:13

It is a rabbit hole usually.

There is an EVAP hose that goes to the fuel tank to catch the fuel evaporation. Sometimes it crumbles and you have air being sucked in via the EVAP solenoid.
Other times the brake pedal seal in the brake booster fails and can suck air freely. Sometimes it is the hose going from the brake booster to the vacuum source(wherever this is on a turbo car)

Of course it could realistically be a fuel issue? Maybe it is the injector itself OR its seals?

Post by **jonesg** » 12 Mar 2024, 16:04

dikidera wrote: 12 Mar 2024, 15:13 It is a rabbit hole usually.

There is an EVAP hose that goes to the fuel tank to catch the fuel evaporation. Sometimes it crumbles and you have air being sucked in via the EVAP solenoid.
Other times the brake pedal seal in the brake booster fails and can suck air freely. Sometimes it is the hose going from the brake booster to the vacuum source(wherever this is on a turbo car)

Of course it could realistically be a fuel issue? Maybe it is the injector itself OR its seals?

a smoke test can reveal vacuum leaks and a fuel pressure test can show a leaky injector.

Passerine · Post by **Passerine** » 15 Mar 2024, 22:17

jonesg wrote: 12 Mar 2024, 16:04
dikidera wrote: 12 Mar 2024, 15:13 It is a rabbit hole usually.

There is an EVAP hose that goes to the fuel tank to catch the fuel evaporation. Sometimes it crumbles and you have air being sucked in via the EVAP solenoid.
Other times the brake pedal seal in the brake booster fails and can suck air freely. Sometimes it is the hose going from the brake booster to the vacuum source(wherever this is on a turbo car)

Of course it could realistically be a fuel issue? Maybe it is the injector itself OR its seals?
a smoke test can reveal vacuum leaks and a fuel pressure test can show a leaky injector.

I've thought about doing a smoke test but I wasn't sure where to feed the smoke, I've read it can damage the MAF sensor but I'm not sure if that's true. My plan was to make one using a bucket, tube, and dry ice.

Passerine · Post by **Passerine** » 15 Mar 2024, 22:18

dikidera wrote: 12 Mar 2024, 15:13 It is a rabbit hole usually.

There is an EVAP hose that goes to the fuel tank to catch the fuel evaporation. Sometimes it crumbles and you have air being sucked in via the EVAP solenoid.
Other times the brake pedal seal in the brake booster fails and can suck air freely. Sometimes it is the hose going from the brake booster to the vacuum source(wherever this is on a turbo car)

Of course it could realistically be a fuel issue? Maybe it is the injector itself OR its seals?

I didn't think about the EVAP hose I will also check that, thank you

Post by **jonesg** » 16 Mar 2024, 03:05

Passerine wrote: 15 Mar 2024, 22:17
I've thought about doing a smoke test but I wasn't sure where to feed the smoke, I've read it can damage the MAF sensor but I'm not sure if that's true. My plan was to make one using a bucket, tube, and dry ice.

remove the maf sensor and inject the smoke in the hole.