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Old 02-08-2019, 11:33 AM
97SVX_SCV 97SVX_SCV is offline
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Old 02-08-2019, 02:15 PM
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Trevor Trevor is offline
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Re: Diagnosing Catalytic converter or MAF or fuel filter or fuel pump or coils

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Originally Posted by 97SVX_SCV View Post
Hello my friends. Cyndee and I own a 1997 Bordeaux LSi, ser #302. She inherited it from her dad who bought it new. it is registered under her name.

I have this problem. The car threw a 'knock sensor circuit malfunction' code. It wasn't knocking and seemed OK so I [please be kind...] ...I stupidly drove it for about 100 miles. it began to run rough, then to barely make it up the hill to home. smelled hot, like the catalytic converters were hot. then would run but just really unpowered.

Situation now- it is a month later and have competed a replacement of the knock sensors and replacement of the PCV and that check valve between the collector and the vacuum tank and a few brittle vacuum hoses whilst I had the collector disassembled, but the car now starts but runs at 3000 rpm for maybe 2 or three seconds then dies. I can keep it going if I feather the throttle but it is way rough and will not keep going at a consistent RPM with a steady throttle input - it has to be feathered or it dies.

I am asking for diagnosis path, really. and considering that this really seems to be a backpressure problem, I want to ask a safe way to first eliminate clogged or failed catalytic converters as the root cause.

Can I safely remove them and check if the relief of backpressure restores idle and throttle response. I know it's going to be noisy. Any perspective is appreciated. thx.
The original knock sensor problem would presumably have resulted in the ECU retarding the ignition during the 100 mile period you ran the car. Commence your diagnosis with this in mind.

Has replacing the knock sensors cleared the code ?
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Old 02-08-2019, 05:48 PM
97SVX_SCV 97SVX_SCV is offline
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Re: Diagnosing Catalytic converter or MAF or fuel filter or fuel pump or coils

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Old 02-08-2019, 08:42 PM
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Re: Diagnosing Catalytic converter or MAF or fuel filter or fuel pump or coils

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Thank you for replying swiftly, Trevor. I will keep your advice in mind.

I had cleared the code before I took everything apart. So, since it only runs for a few seconds, I believe the ECU is not really in opportunity to throw any codes. Isn't it likely going through a number of system checks until all systems are found nominal? And since I disconnected the battery to do the repair, isn't it also going to identify that it needs to recalibrate, so isn't that going to further delay any new codes?

I haven't dived deep in the manual to be certain, but it seems like computer systems behave that way. If you have some advice on bypassing the cats safely it would be appreciated.

Again. many thanks.
But before this, did you run the car for 100 miles with the code registered ?
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Old 02-09-2019, 07:52 AM
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Re: Diagnosing Catalytic converter or MAF or fuel filter or fuel pump or coils

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catalytic, dies, idle, knock sensor, maf

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