The direct-injection 3.6's high-pressure fuel pump wears down and its injectors carbon up, usually together. We replace the pump and all six injectors in one visit at your home.
The direct-injection LLT and LFX 3.6 V6s run a mechanical high-pressure fuel pump driven off the camshaft through a follower, a small bucket that rides a cam lobe and strokes the pump thousands of times a minute. That follower is a known wear item: as it wears, pump stroke shrinks, rail pressure sags, and the ECM logs P0087 (fuel rail pressure too low). GM's special coverage program on related fuel-system failures tells you how widespread this was, and that coverage has long since expired for most of these cars.
While the pump fades, the injectors are fighting their own battle. Direct injectors live inside the combustion chamber, and on these engines carbon builds on the injector tips, distorting spray patterns. The result is the classic DI misery package: hard cold starts, extended cranking, rough idle until warm, and a lumpy misfire feel that no spark plug change fixes. Low rail pressure and fouled injectors produce overlapping symptoms, which is why halfway diagnoses, replace one injector, then the pump a month later, burn money.
The repair that actually ends it is the full set: new high-pressure pump with its follower (and a cam lobe inspection, because a badly worn follower can damage the lobe that drives it), plus all six injectors with new seals. One visit, one fix, done.
If your GM is doing any of these, this is the likely cause:
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High-Pressure Fuel Pump & 6 Injector Replacement is a big job and shops quote $2,800–$4,500 for it. The single most valuable thing you can do before committing that is have the diagnosis confirmed independently, $100–$250 flat, at your location, no hoist needed, because a diagnosis isn't the repair. Plenty of cars arrive at that quote and turn out to need the smaller version of the problem.
And the honest scoping condition, up front: once I've seen it, I tell you straight whether it's something I can do at your place. If it needs a hoist, a press or a machine shop, I say so and point you to someone who has one. I don't take a job and figure it out in your driveway. That's the whole deal, and it's why the diagnosis comes first.
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Low rail pressure leans the engine out under load, that's hard on pistons and catalytic converters, not just annoying at startup. And a worn pump follower, ignored long enough, can wear through and damage the cam lobe that drives it, escalating a fuel-system job into engine teardown territory. The long-crank stage is when this is still a straightforward fix.
Yes. We depressurize the system before opening it, replace seals as a rule rather than reusing them, and pressure-test before the engine ever runs. It's most of a day in your driveway, with no need to leave the car at a shop.
Six DI injectors plus an OEM pump is a serious parts bill, and injector extraction on a carboned engine books real labour hours. We quote one flat price for the whole system, pump, follower, six injectors, seals, testing, before any work starts. No per-hour meter, no mid-job add-ons.
We can, but on a 2008–2015 DI engine with these symptoms, partial fixes almost always come back. The injectors are all equally aged and carboned, and most of the labour is shared. Doing pump plus all six once is cheaper than doing this job in three instalments.
GM ran special coverage on related fuel system failures for these engines, but it was time- and mileage-limited, most cars are well past it now. It's worth a VIN check with GM first; if you're outside coverage, we handle it at your home.
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