Skip the auto shop - Our mechanics make house calls

Q: Lexus IS300 won't start after transmission and engine swap

asked by on

i did a auto to manual swap changed the wiring harness inside and out including the ecu etc and i threw the manual motor/transmission onto my vehicle but only my lights and electronics work. car won't even attempt to start or sputter or anything. what can cause my car to not start? i changed all my fluids, and belts as well. i made sure i didn't mess with timing on the timing belt and kept it to how it basically was (which was properly timed)

My car has 158490 miles.
My car has a manual transmission.

There are countless reasons your engine might not run after a swap like this. One thing to keep in mind, however, is that an engine needs three things to run: spark, fuel and compression. Checking for each systematically will help narrow down the potential causes for your concern. Spark can be checked with an inline spark tester. Fuel pump operation can be checked with a fuel pressure tester and fuel injector control can be checked using a noid light. Finally, compression can be checked using a compressor tester and/or a leak down tester. Diagnosing your vehicle’s no-start condition could be very difficult and time consuming. If you’d rather have a professional tackle the job, keep in mind YourMechanic comes to your home or office. We would be happy to diagnose and repair your no start condition.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: largest motor for 2008 chevy cobalt

The hardware and software of the computer (powertrain control module) and transmission control module (TCM) in the Cobalt will only work with your present engine. If you change the engine to one that is not a catalog interchange for the...

Q: I have a GS Lexus 400 1994 alternator needs be replaced but GS 400 not pulling up need a quote on fixing

Hello, thank you for writing in. The submodel you are looking for may not be on our website at this time. There are a couple of options from here. One, you can use a similar submodel to get an idea...

Q: 2004 lexus IS300 P0010 P0122 P2138 ALSO ERASED CODE P05OO AFTER CLEANING BOTH SENSORS IN TRANNY NOW CAR OVERHEATS IDLES @2000 in p

Hi Braxdon. Thanks for contacting us today. Of the error codes you've listed, the one that might be the root source of your problems is the P2138 OBD-II Trouble Code. The P2138 trouble code indicates that the Engine Control Module...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.