Replaced exhaust car doesn't start
04-24-09, 07:08 PM
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Replaced exhaust car doesn't start
Today I replaced the exhaust on my Lexus ES 300 - 1998 Year. I replaced the center piper and the muffler. Everything went fine. The oxygen sensor took a little tries but it looks fine (Not 100% sure though).
I didn't have any problem with the car over the winter or even before the job. The car wouldn't start any more. Any ideas what is going on?
The battery is fine. Doors and security system work just fine. It tries to start but the engine never takes over. It's like the engine is not firing. I borrowed a diagnostic meter. Despite being plugged it gives a message that there is no communication.
I didn't have any problem with the car over the winter or even before the job. The car wouldn't start any more. Any ideas what is going on?
The battery is fine. Doors and security system work just fine. It tries to start but the engine never takes over. It's like the engine is not firing. I borrowed a diagnostic meter. Despite being plugged it gives a message that there is no communication.
04-24-09, 07:35 PM
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04-24-09, 08:04 PM
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Use a voltmeter, and make sure that both of the fuses are supplying power to the ecm. Measure the voltage at the ecm connector. Also verify that the grounds are good. I ask about the O2 sensor because the harness may have been damaged,/ shorted.
04-24-09, 08:09 PM
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going out with a volt meter. Any suggestion/place to check grounding? What happens if the harness is damaged / shorted? It might have because the capon top of it loose. Had to turn it hard to get it off the rusted pipe. Am I looking at an expensive repair?
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04-25-09, 07:17 PM
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Check the connector at the ECM for power,on both incomming power leads. You need to establish communication with the ecm. Or you could just start replacing parts, but that gets expensive
04-25-09, 09:02 PM
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Make sure the fuel pump is working too.....the o2 sensor doesn'y really have anything to do with engine start. All it does is measure the output of the catylatic converter to make sure it is doing its job.
04-26-09, 12:14 AM
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IIRC, disconnecting the oxygen sensor just sends the computer into 60% duty cycle, which would still allow you to run. On the other hand, have you checked to see if you're getting spark at the spark plugs? pull your fuel pump relay, pull out a spark plug, and see if you can get it to arc over on the valve cover or something (wear leather gloves or you're in for a shock). Or if you have a timing light, you could just use that to see if it can read the spark in each wire.
04-26-09, 01:02 AM
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[QUOTE=llcoolpass;4469520]you killed the ecu with the welder
Man, I didn't even think about a welder, but if he had been welding the new pipe on, the ECM might have been toasted, along with a few other modules.
Man, I didn't even think about a welder, but if he had been welding the new pipe on, the ECM might have been toasted, along with a few other modules.
04-26-09, 03:30 AM
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[QUOTE=GEORGE_JET;4469565]
There was no welding involved. Just cut the old rusty screws and piped the new center pipe in with new gasket and screws. The oxygen sensor was tough to remove so had use some force that broke the top casing on the sensor.
The igniter is not receiving any voltage (checked all pins). Should I look at replacing the ECM? What do I need to do - any recalibration?
The igniter is not receiving any voltage (checked all pins). Should I look at replacing the ECM? What do I need to do - any recalibration?
04-26-09, 03:31 AM
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IIRC, disconnecting the oxygen sensor just sends the computer into 60% duty cycle, which would still allow you to run. On the other hand, have you checked to see if you're getting spark at the spark plugs? pull your fuel pump relay, pull out a spark plug, and see if you can get it to arc over on the valve cover or something (wear leather gloves or you're in for a shock). Or if you have a timing light, you could just use that to see if it can read the spark in each wire.