LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

how to tell a 95 is missing ??? no tps sensor reluctor ring....

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Old Sep 26, 2006 | 08:49 PM
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red96z's Avatar
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From: memphis tennessee usa
how to tell a 95 is missing ??? no tps sensor reluctor ring....

to read missfires . had car tuned by ed wright a couple months back.. and just finished installing new plugs with my new nx system and it seems to be running a little rough it may just be me but it smells a little rich also... i havent driven it in a few months also so it really could be me but...maybe a small miss hard to hear but maybe there????? i was going to double check my wires in the morning then what???? can a scan tool check it with no tps or reluctor ring ??? what to do ..how do u check for misfires in 95 models?
Old Sep 27, 2006 | 06:48 AM
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Re: how to tell a 95 is missing ??? no tps sensor reluctor ring....

I think you have the right idea just the wrong nomenclature. The Crank Position Sensor is also known as the CKP and you are correct. It wasn't used until the advent of OBDII in 96. The TPS is the throttle position sensor which all years use.

A misfire can be detected a few ways. One way is pull either the plug wire or the injector clip off and see if the engine runs differently then when it was on. Change means it was firing (at least better) then it is with it off. No change means that cylinder was not firing at all.

Since you have long tubes, I like to check for misfires the lazy way (no dirty hands either). It will work best if the tubes are completely cold. Start er up and immediately check all the tubes for temperature using an IR thermometer. You should see all the tubes temperatures rising at about the same rate. About. The one that's staying cool is not firing.

Found an original equipment plug wire near the alternator that was firing through the side of the insulation to the alternator bracket this way. Was able to reposition it until a set of replacements was available.

One other thing. Remember that open loop enrichens the fuel mixture. If there is a restriction at the injector, it's possible that it might lean out to the point it misfires after going to closed loop. And it is more likely under load then just at idle. That's why it's a good practice to regularly clean the injectors both with in tank cleaner and professionally. It's also a good idea to look at the O2 readings and the fuel trims while cruising in real time.

Last edited by Guest47904; Sep 27, 2006 at 06:50 AM.
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