98 T/A Timing!!

**90ARAPAJ** · 06-29-2011, 07:27 AM

So, i posted recent threads on my lack of power because of knock sensors. I have been told that its timing. Please explain to me how that works. Just for a breif my car just feels slow at time and at some times it feels like a freakin bat outta hell but my brother told me it was knock sensors and according to people it obviously wasnt. please explain to me why my car with 46,000 original miles and boltons is getting robbed of power.....

**ls1ws6ben** · 06-29-2011, 05:36 PM

honestly it would be kinda pointless trying to figure this out without maybe hooking it up to a computer to see whats going on.. could be alot of things.. these things have so many sensors now days that just guessing is useless.. bad sensor, vaccum line messed up, clogged injectors, bad air filter, clogged cats, blown fuse, yada yada yada.. you may get an idea from asking on here but your best bet is to get it to someone who knows a thing or 2 about these motors.. pay whatever charge it is to diagnose it narrow it down to just a couple things or pin point it right away.. thats what i would do.. but thats just my opinion

**pajeff02** · 06-29-2011, 05:54 PM

When the knock sensor detect irregular combustion events they send a signal to the PCM. The PCM then pulls timing in an attempt to eradicate the knock. With a scanner, you can actually see the PCM retard the ignition timing.

**0rion** · 06-29-2011, 08:05 PM

like was stated.....you really need to log the car and see what's going on. You can log your knock and timing to see what's happening. Always run premium in the car? It's important that you do or you'll get bumped to the low octane spark table in the pcm.

98's do have sensitive knock sensors. Even still they also run the most aggressive timing table of the f-body LS1's. Some will get 3 degrees of knock no matter what you do. I basically had to disable my sensors altogether even after putting on the 99+ sensors and harness.
The first step though is to log the car and see what's going on.....it might be true knock and not false knock so you'll want to sort that out before going any further.

**90ARAPAJ** · 06-30-2011, 09:16 AM

Originally Posted by 0rion

like was stated.....you really need to log the car and see what's going on. You can log your knock and timing to see what's happening. Always run premium in the car? It's important that you do or you'll get bumped to the low octane spark table in the pcm.

98's do have sensitive knock sensors. Even still they also run the most aggressive timing table of the f-body LS1's. Some will get 3 degrees of knock no matter what you do. I basically had to disable my sensors altogether even after putting on the 99+ sensors and harness.
The first step though is to log the car and see what's going on.....it might be true knock and not false knock so you'll want to sort that out before going any further.

so you have a 98 t/a?? when your sensors were bad did you get robbed of power?? and when you disabled them did you notice a difference??? also how do i disable them??