1999 v70T5M56 P1238 P1171 P0172 rough idle, stall Topic is solved

Post by **abscate** » 14 Feb 2019, 05:01

Elizabeth popped some codes aftertaste Tuesday epic winter storm trip

I noticed a slight flutter on rundown , idle fluctuating between 700-900 rpm before settling in at 850 rpm

In providence, the idle went rough, 500-1000 and hunting , stalling about 5% of time

Running at speed fine, good power. 28 mpg at 60 mph

At home , on idle it popped codes

p1238 - Turbo Boost leak or Valve problem

P1171 - Long term fuel trim Lean limit

p0172 - Rich error code

Plugs new, coils and ETM are about 60k old

I'll be looking at the vacuum lines and induction hoses in the warm weather coming up

I might stick my spareMAF on it today

Post by **RickHaleParker** » 14 Feb 2019, 05:14

I'll wager you picked up a intake air leak, particularly the charge pipes.

Post by **abscate** » 14 Feb 2019, 08:25

RickHaleParker wrote: ↑14 Feb 2019, 05:14 I'll wager you picked up a intake air leak, particularly the charge pipes.

Irish betting only giving 5:7 odd on that bet

Post by **abscate** » 14 Feb 2019, 10:59

Well cold start this morning went up to 1100 rpm, then idled down to 840 smooth as silk
Ambient 32F

Looks like another one for the intermittent symptom study.

Added codes to the thread title

Post by **RickHaleParker** » 14 Feb 2019, 15:01

The one thing all three have in common is intake air leak. P1238, the leak tends to be after the Turbo.

Post by **abscate** » 14 Feb 2019, 18:07

I'm wondering if the intercooler didn't ice up in the nasty weather

Post by **wizechatmgr** » 15 Feb 2019, 20:29

abscate wrote: ↑14 Feb 2019, 18:07 I'm wondering if the intercooler didn't ice up in the nasty weather

Any idea if yours has the drain hole drilled into the bottom near the corner?

Post by **abscate** » 16 Feb 2019, 00:28

It does. I'm still puzzled about the clear symptoms of induction leak which self healed.

Inter cooler icing would have killed operation under load, I would think.

Post by **wizechatmgr** » 16 Feb 2019, 01:42

I've been using breeze clamps on everything I touch now. I know at one point Albany Mack was recommending utilizing constant torque clamps on all trucks they work on.

Happen to smoke it yet? =)

Post by **abscate** » 24 Feb 2019, 08:40

Haven't had this return. Closing this one off until return.