Q: I have a 2002 buick rendezvous and I'm looking to possibly swap the 3400 for an lx9 3.5

asked by on

I have the infamous GM 60° 3400 and I have yet to experience the mechanical hailstorm of the LIM gasket. As I figured it's only a matter of time before it arises, I thought about swapping to a whole new engine once I need to. I'm considering the lx9 3.5L due to the fact that it's very simular to the 3400 is terms of size and fit. I was curious what the advantages and disadvantages would be and if this would be a smart/recommended action. Thanks.

My car has 72000 miles.
My car has an automatic transmission.

The re-designed gasket (Fel-Pro, for example, in the aftermarket) for the lower intake manifold on this engine, and the revised installation procedure, provide a 100% effective resolution to the notorious leak issue that you are referring to. With regard to engine swaps, inasmuch as the vehicle engine is matched to the on board computer (hardware and software), all vehicle sensors and the vehicle wiring harness, it is not practical to substitute any engine that does not come up in a GM parts catalog as a direct, 100% compatible interchange. If you desire to install a non-interchange engine, you would have to change out the vehicle’s electrical system (PCM/ECM) which is just not practical. If you desire that the intake manifold gasket be updated, in order to resolve a current leak, or just as a preventive measure, please request lower intake manifold gasket replacement and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I have a 2002 buick rendezvous and I'm looking to possibly swap the 3400 for an lx9 3.5

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Overheating coolant reservoir has a pinhole in it. Is this the cause of overheating?

Hey there. If the coolant reservoir is leaking, then it could leak out enough coolant to cause the engine to overheat. The reservoir is known to get stress heat cracks and leak coolant. You might see a small pinpoint leak,...

Q: Car won't start after repairs

Hi there. The issue you are having is a symptom of an intake manifold leak. If the manifold is leaking the vehicle's computer will be unable to compensate for the big change in air flow that the leak creates, resulting...

Q: I have a 2009 expedition flex fuel 5.4l 3v with the VIN's 8th digit being a 5. Will a VIN's 8th digit being a V work?

If you are wanting to change out the engine block, then you can for there are no numbers on the engine blocks. The only thing is different is with the electronics on the engine that works with the fuel management...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...