Logically, nothing should be wrong- upper turbo hose
Blew off my upper turbo hose on Wednesday afternoon. Had been driving home, and about 400 yards away from home, I had to stop at a light. I left as normal, but the car was seriously down on power and a loud wwwhhhHHHOOOSH greeted me as I pulled away, coming from the passenger side of the engine. First thought was: turbo clamp. And I was right. No place to stop and I could literally see where I lived. I had little choice so I limped it home at about 20mph.
I popped the hood and the upper hose was loose at the rear connection. Hose was also partly displaced. An 11mm wrench and five minutes solved that. I worried a moment about something being ingested into the turbo, but what was I going to do about it if that happened? Not much.
Started it up and it sounded....odd. I owned an '07 GXP when new. I'm used to the 'normal' sounds these cars make and since by their nature inline fours are not engines that sound sexy or even nice, I always 'tuned out' the noises. I can't describe the odd quality to the sound but it was not a "bad" automotive noise, a thing I am familiar with from decades in the old car hobby wrenching and building engines.
I decided I never really was under the hood when the car was running-ever, including my '07 ten years ago, and I was just not familiar with the sounds. I closed the hood and backed up. I did hear a "bad" sound- a 'guh-danga danga danga' noise of something being unbalanced, loose, and thinly metallic. I cautiously pulled forward. No such noise repeated. I gently drove it a bit. Normal. Drove 20 miles, radio and blower fan off, windows down. No problems. Car reported 16psi boost, and it broke the tires free into third gear- as is normal for an un-tuned GXP at my altitude, in my experience. I called that fixed and had dinner. I drove the car into work today, 22 miles. No issues.
Coming home it rained. The windows were up. I heard two odd things. Both may have always been present, but I had tuned them out since the car was 'normal' previously, and now I am listening intently.
First is a thin high pitched tone at low volume. Not a whine. Very similar to the sound a radio makes when on but the volume is all the way down.
Secondly, a tick. Not the HPFP tick, I am very familiar with that HPFP sound. The tick is equally audible on both sides of the engine bay. My experience tells me this is coming from the head or the block. I do not specifically recall this tick previously, but I am logically sure it was always there and always will be, on all of them, to one degree or another. Inline four, AL head and block. Noisy engine.
The car has normal power according to the boost gauge and butt dyno. The audible tone probably was always there as was the tick.
As far as the 'guh-dangy' noise for a split second goes, I feel that since the turbo is freely , it was out of balance. A little boost and the noise went away.
Logically, no damage occurred and the problem is truly fixed. I see no actual evidence of a problem other than a nagging doubt about what I used to hear, since I never paid attention before. Thoughts?
Also wondering if a MA member in the Norfolk county region might be available so I can compare my engine sounds to his or hers. A cellphone recording is, unfortunately, not a great solution for noises in my experience.
Driving and working on a Sly 2008 Solstice GXP 5spd 260/260, and the worst-built 2012 LS3 Camaro 1SS to escape from Oshawa.
Gone but not forgotten:
2007 Solstice GXP 5 speed 290/340
Stored and needing to part ways with a 1970 Skylark Custom convertible I have owned since 1989 and turned into a GS455 clone. 462 with 7/8 primary headers, adjustable roller rockers, TA Performance Stage 1 aluminum heads, auto, Chevy 12 bolt, 3.31:1. Sadly a project car now but a driver from '89 to '06.
Last edited by ChrisBlair; 07-12-2019 at 11:46 AM.