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: Q: Brake fluid leaking

Hi there. There are two copper crush washers, one on each side of the banjo fitting (the "banjo" is the segment of the brake hose that the bolt is put through). The reason it is leaking is you appear to...

Q: Engine whirls when it is started. The engine makes a audible but not loud WHIRRING (not squealing) sound when foot is on the gas.

There could be a hole in the intake air cleaner hoses or a drive belt that is loose causing the whirling sound. Try removing the drive belt and driving the vehicle for a short time. The battery light will come...

Q: Engine was swapped. I need to know how to tell if they put 1.8 or 2.0 back in?

Each of those engine sizes have unique casting numbers embossed on the head, block, etc. The casting numbers for the 1.8L are Block Cast # 5M0; In-Line Head Cast # 5M0; Cam Cast # 5M0-5M0 or 4M5-4M5; and Crankshaft...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.