"50ford500" (50ford500)
12/15/2018 at 15:19 • Filed to: None
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"50ford500" (50ford500)
12/15/2018 at 15:19 • Filed to: None | 0
| 5 |
So we were headed to my dads last night in the wife’s 13 Acadia and it all of the sudden decided to throw “reduced engine power”, “service stabilitrack” and “Stabilitrak off” messages along with a CEL and proceeded to not let us go over 40 mph. Pull over to the side of I20 (in the dark) and wait for her dad to come get them.
I wait for the tow driver and do research on what it could posssibly be while waiting and settle on possibly the throttle body. Driver loads and we get home it doesn’t want to fire off now so...maybe a fuel problem. I’m sure scantool will help me diagnose but I am still hopeful it’s just a gummy throttle body. I run the codes today and all signs point to a faulty hi pressure pump so far. All codes are fuel related and specifically to bank 2. In addition real-time monitor shows the lift pump at about 60-70 where it should be but the high pressure pump can’t get past 100 psi when it has a range up to about 4500.
So I’m sure the mechanic will love us this year. Now if she can manage to drive my car sensibly as it will be the only other one we have while hers is in the shop For who knows how long. I can do a lot but messing with the HPFP system seems a bit above my pay grade/capability.
Spamfeller Loves Nazi Clicks
> 50ford500
12/15/2018 at 16:00 |
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I truly do mean this with the utmost respect: DO NOT PLAY AROUND WITH THE HPFP, YOU ARE NOT QUALIFIED. That. Shit. Will . Kill. You.
This is coming from someone who is intimately familiar with the HP side of the fuel system on multiple makes . And still has done damage to himself and engines working on it.
If you only have codes on one bank? It’s not the HPFP system. Th e problem is actually an intake manifold gasket, cam solenoid, or something along those lines. T he LLT is a single-pump system. If the pump failed, it would be both banks, not one bank. So it’s not the throttle body either.
The 100psi indicates the computer has locked it in low-pressure mode due to major fault . It requires the Tech2 to reset the HPFP system once it goes into limp-in locked in low pressure mode. So the low pressure is a red herring you’re chasing. You’re looking for a mechanical problem that will affect only a single bank. Could even be a cracked exhaust manifold.
Basically, take your codes, scratch all the HPFP system codes as irrelevant, look only at your mechanical codes. (Misfire is not an HPFP system code; it’s a mechanical code.) Start your troubleshooting and diagnosis there.
However, if there is ANY abnormal smell of fuel, TOW TO A MECHANIC. It may be a failed fitting, seal, or pipe. THESE WILL CAUSE A FIRE. (LLT is a ‘low pressure’ system at 1750-1850psi .)
Once you fix the mechanical though , you’ll unfortunately still need a mechanic or dealer to reset the computer. The SIDI system locks it out and will require being set back into learn mode.
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50ford500
> Spamfeller Loves Nazi Clicks
12/15/2018 at 16:19 |
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Yeah I somewhat got the impression that playing around with the HP side would probably be a VERY bad idea and after I got it up and running you can smell the fuel though it was pulling a code for both banks a few times as well I wasn’t ware it was a single pump system but anything that’s fuel related I tend to shy away from at least on newer stuff. Let the mechanic figure it out is probably safest here.
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Spamfeller Loves Nazi Clicks
> 50ford500
12/15/2018 at 16:42 |
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Many portions of the HPFP system are completely safe and easy to repair if you’re comfortable working on the low pressure side. The biggest reason I tell people to never mess with the HP side is because ANY mistake is catastrophic and almost CERTAINLY injurious. There is absolutely zero room for error.
So even though doing the HPFP itself is actually a very straightforward operation, unless you are 100% comfortable with doing absolutely everything exactly to spec with no room, margin, or tolerance for error? It’s not something you want to do in your driveway. You certainly CAN , and it’s not a technically challenging job at all. But it’s a question of confidenc e and risks. If you’re not comfortable with low pressure systems, I wouldn’t advise trying to make the jump to high pressure.
If you’re getting a strong fuel smell and intermittent codes on both banks though, I would probably recommend towing. I don’t know the LLT very well so I don’t know if there’s a high occurrence of pipe breaks or injector failures or anything like that. But even at 100psi, even a loose connector can easily cause a fire.
merged-5876237249235911857-hrw8uc
> Spamfeller Loves Nazi Clicks
12/15/2018 at 20:10 |
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It really depends on the vehicle. The HPFPs on my S8 are front and center, easy on and off. They have very stout ball end fittings too. Really nice stuff. I have no reservations working on this particular sys tem. But it’s case by case, and car by car.
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Spamfeller Loves Nazi Clicks
> merged-5876237249235911857-hrw8uc
12/15/2018 at 20:32 |
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Well, as I said, it’s a question of your confidence and comfort with low pressure systems. The LLT pump’s a bit inconvenient to access (under the intake manifold) but it’s all of one line, two pipes, and two bolts. Easy peasy. LTG’s even easier - one connector, two pipes, two bolts. Like I said, mechanically, it’s easy.
But all the ease in the world doesn ’t help if you torque ‘em wrong, or if you don’t depressurize correctly, or if you hook ‘em up wrong. And at the end of the day, if you aren’t comfortable working at 38psi, taking on 1750psi+ is ill advised.