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Exhaust problem.

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Old May 21, 2011 | 08:39 PM
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Celestial-Fc's Avatar
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From: On the dark side of the moon
Exhaust problem.

Ok so I took off my stock cats and i put my new aftermarket cats on.(bonez) so I started my 7 up and then it smelt like it was burning. Any idea why?
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Old May 21, 2011 | 10:02 PM
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Vacuum or fuel help

Ok so I just replaced my exhaust but still problems. My engine seems to be either be not getting enough fuel or a vacuum leak. So the car starts and runs but when I'm test driving tryig to push it a little the exhuast turns red hot and then dies. But also could it be blown apex seal or rotar?
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Old May 21, 2011 | 11:45 PM
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Did you mess with anything other than the cats? Glowing exhaust is typically a timing problem; ie the CAS improperly stabbed.
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Old May 21, 2011 | 11:56 PM
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Originally Posted by RotaryRocket88
Did you mess with anything other than the cats? Glowing exhaust is typically a timing problem; ie the CAS improperly stabbed.
All I did was replace cats. What is the CAS? And how can I fix it?
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Old May 22, 2011 | 10:13 AM
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Any help please?
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Old May 22, 2011 | 10:15 AM
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The Factory Service Manual can be found in the FAQ For FC thread. It contains all this information and more, and is an essential tool for any sort of service work that needs to be performed on these cars.

Additionally, the Haynes service manual for the 1986 thru 1991 RX-7 (both turbo and NA) can be found at most local auto parts stores or purchased from any good bookstore (ISBN number 1 56392 007 7). It is only about $25 and is a great quick reference for things like this. Not only does it contain most of the information in the FSM condensed into an easy to read format, but it includes full wiring diagrams as well.

These manuals will answer 99% of service related questions for the car and if you intend to do your own repair work, you will need at least one of them. Preferably both, since the FSM is a free download.

There are procedures in both the Haynes and FSM for checking the timing. You'll need a timing light.

If timing checks out, you may have lost an injector. Or, are your ignition leads connected wrong? Leading and trailing reverse?

What is the history of this problem? Did it just happen one day?

Normal though for a new exhaust to smell a little as coatings and such burn off.
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Old May 22, 2011 | 10:32 AM
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From: On the dark side of the moon
Originally Posted by Aaron Cake
The Factory Service Manual can be found in the FAQ For FC thread. It contains all this information and more, and is an essential tool for any sort of service work that needs to be performed on these cars.

Additionally, the Haynes service manual for the 1986 thru 1991 RX-7 (both turbo and NA) can be found at most local auto parts stores or purchased from any good bookstore (ISBN number 1 56392 007 7). It is only about $25 and is a great quick reference for things like this. Not only does it contain most of the information in the FSM condensed into an easy to read format, but it includes full wiring diagrams as well.

These manuals will answer 99% of service related questions for the car and if you intend to do your own repair work, you will need at least one of them. Preferably both, since the FSM is a free download.

There are procedures in both the Haynes and FSM for checking the timing. You'll need a timing light.

If timing checks out, you may have lost an injector. Or, are your ignition leads connected wrong? Leading and trailing reverse?

What is the history of this problem? Did it just happen one day?

Normal though for a new exhaust to smell a little as coatings and such burn off.
my injectors are fine. leading and trailing are fine. its been like this for 1 month already. whatever it is causes my engine to shake, my exhaust to turn red hot and hesitation untill it reaches 4000rpm. at first i thought it was just exhaust and it was clogged bc it was shaking alot also but found out it isnt. the CAS is making noise sound like a vacuum leak but not totally sure.
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Old May 22, 2011 | 10:06 PM
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Could my engine problem be due to a manifold leak or something like that? I Still need help please.
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Old May 23, 2011 | 10:36 AM
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How do you know the injectors are fine?

Is the vacuum line to the boost sensor on the passenger side shock tower disconnected? Test that sensor as per the FSM.

If you think you have any vacuum leaks, you must go through the system and fix them. Air leaking in from anywhere will cause major issues.
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Old May 23, 2011 | 12:14 PM
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From: On the dark side of the moon
Originally Posted by Aaron Cake
How do you know the injectors are fine?

Is the vacuum line to the boost sensor on the passenger side shock tower disconnected? Test that sensor as per the FSM.

If you think you have any vacuum leaks, you must go through the system and fix them. Air leaking in from anywhere will cause major issues.
my injectors are brand new and alright ill ill do that. thanks aaron!!!
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