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Old 11-16-2013, 07:29 PM   #1
XDoXWhatX
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Dizzy No start unless gas pedal floored wont stay running when rpm dropes below 2000

Recently did an engine swap my previous engine had a spun bearing. used a block out of a 1996 sc2 and the head out of my 2002 had to make 1 modification to a sensor not sure which 1 it was. everything else matched up fine no vacuum leaks that I can find plugs and wires fine double checked timing and still no luck any ideas?


also to note rpms top out ant 4000 and if car is cold it will start once fine without using gas pedal after that it has to cool down.

Last edited by XDoXWhatX; 11-16-2013 at 07:32 PM.. Reason: new info

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Old 11-16-2013, 07:49 PM   #2
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1998 SC2
Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

What model/year of car and what year and model of PCM? Figure out which sensor you modified/changed and exactly what did you do to it.

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Old 11-16-2013, 07:52 PM   #3
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

I found out it was the knock sensor the old 1 didn't match up had 1 wire mine has 2 and a different bolt size so I bored it out to match the correct size did that damage it? and I have a 2002 sl2

Last edited by XDoXWhatX; 11-16-2013 at 07:58 PM..

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Old 11-16-2013, 08:00 PM   #4
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

if you look on autozone I think you might be able to see the difference between the 96 knock sensor and the 2001 and srry its a 2001 not 2002

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Old 11-16-2013, 08:17 PM   #5
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

and how do I check pcm model number I know its the pcm that is right next to battery tray

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Old 11-16-2013, 08:20 PM   #6
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1998 SC2
Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

If you did not change it then it is the same as your car. Your problem is either the TPS or the ECTS most likely. Have you done anything to the ECTS? Did you ever replace it ? Is the connector clean? Did you disconnect the PCM when doing this bottom end swap?

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Old 11-16-2013, 08:22 PM   #7
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1998 SC2
Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

Drilling out the knock sensor may have killed it but that would not cause the problem you are having.

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Old 11-16-2013, 08:27 PM   #8
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

well im almost done getting the timing cover off again going to reset timin see if that helps

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Old 11-16-2013, 08:44 PM   #9
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1998 SC2
Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

The timing should be fine. If the keyway is at 12:00 when the cam sprocket pips are at 12:00 this it is fine, chain from exhaust cam must be tight and do not crank engine backwards or you may break the tensioner.

As I said, you probably have an ECTS issue only.

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Old 11-16-2013, 08:53 PM   #10
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

Quote:
Originally Posted by OldNuc View Post
If you did not change it then it is the same as your car. Your problem is either the TPS or the ECTS most likely. Have you done anything to the ECTS? Did you ever replace it ? Is the connector clean? Did you disconnect the PCM when doing this bottom end swap?
I did disconnect the pcm and no I haven't done anything with the ects and srry didn't see this post right away

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Old 11-16-2013, 08:54 PM   #11
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

and I tps looks fine and I also cleaned the iac it was horribly dirty

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Old 11-16-2013, 09:03 PM   #12
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

I just pulled the ects it looks like someone replace the wire to it and how do I tell if it is bad?

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Old 11-16-2013, 09:19 PM   #13
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1998 SC2
Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

Buy a new ECTS and if the connector looks the least bit bad or the wiring is cobbled up replace connector and solder splices. Go to JY and get a connector for the IAT sensor located in the air box with as much wire as you can get. That sensor will cause the engine to literally drown in gas when starting if it is not perfectly OK.

Last edited by OldNuc; 11-16-2013 at 09:34 PM..

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Old 11-16-2013, 09:27 PM   #14
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

jy? and what do u mean with as much wire as I can?

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Old 11-16-2013, 09:36 PM   #15
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1998 SC2
Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

JY=Junk Yard pick and pull. That is a painfully expensive connector and you can get about 8" of wire along with the IAT connector before you hit the main loom and that should be enough.

The ECTS sensor is a Standard Motor Products TX73 or equivalent from your local parts store. Do not overtighten as they will snap off just snug works fine.

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Old 11-16-2013, 09:37 PM   #16
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

jy = Junkyard.

Don't cut the connector off with 0.5" of wire, try to get all 12" or more of it. Cut it where it meets the rest of the harness and you'll have enough.

...
The proper way to fix a S-Series automatic is to replace it with a 5spd O:)

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Old 11-16-2013, 09:38 PM   #17
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

ok ty ill let u know how it goes ill try sensors first since the junkyard is closed

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Old 11-16-2013, 09:45 PM   #18
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1998 SC2
Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

All your other sensors are fine, do not fix what is not broke. Just fix the ECTS and then see what else is fubar.

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Old 11-16-2013, 09:53 PM   #19
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Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

ok since I had already had the timing cover off before I came back and saw your post about the ects I figured it wouldn't hurt to reset anyways and the pin on the exhaust where the sprocket goes on is broken is that pin replaceable? or would I need a new exhaust cam?

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Old 11-16-2013, 10:17 PM   #20
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1998 SC2
Default Re: No start unless gas pedal floored wont stay running when rpm dropes below 2000

You must get a new Gen-3 exhaust cam. Set the keyway to 3:00 before removing chain to change cam. After new cam installed turn crank counterclockwise until keyway is at 12:00, pin cams and install chain.

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