93/94 swap hard start.
11-07-2010, 05:24 AM
#1
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93/94 swap hard start. I just finished up swapping the 94 4l60e/harness/computer/etc.. into my 93 formy.
I am having problems with it starting. When I go to start it I let the fuel pump build pressure then I crank the engine, the engine cranks for a little while. I am peddling the throttle slightly it will not even fire if I do not do this.
Related info:
- I do have a cel, but have not pulled the code
- The pcm is tuned for this setup(mostly anyways)
- I am running a 93 throttle body
- Once it fires and runs it runs very good
Oh, I tried switching to a later year throttle body and it would fire quick and easy but it would rev to about 2 grand for a second then die.
If I revved it on startup sometimes it would try to idle but usually failed. IAC problem?
If you have any suggeestions or help I would really appreciate it.
Thanks!
I am having problems with it starting. When I go to start it I let the fuel pump build pressure then I crank the engine, the engine cranks for a little while. I am peddling the throttle slightly it will not even fire if I do not do this.
Related info:
- I do have a cel, but have not pulled the code
- The pcm is tuned for this setup(mostly anyways)
- I am running a 93 throttle body
- Once it fires and runs it runs very good
Oh, I tried switching to a later year throttle body and it would fire quick and easy but it would rev to about 2 grand for a second then die.
If I revved it on startup sometimes it would try to idle but usually failed. IAC problem?
If you have any suggeestions or help I would really appreciate it.
Thanks!
11-07-2010, 05:15 PM
#3
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I think the problem is not related with your swap, u should check you tps voltage.
check this link: http://www.lt1swap.com/93lt1a4.htm
check this link: http://www.lt1swap.com/93lt1a4.htm
11-08-2010, 12:32 AM
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Also it is tuned for a 52mm aftermarket throttle body and I am using oem ones to test.
Other than that it is tuned for the 306 cam in a similar setup.
Hopefully I can wake up in time to go fix the brakes and put the exhaust on it so I can take it to oriellys and pull the codes.
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11-08-2010, 06:54 PM
#8
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You need the stock tune back in it pal...
11-09-2010, 01:51 AM
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Dont have it
I have one in it now.. Its better but it still starts hard. It started great and idled great for a while but now its starting hard.. It idles decent though.. I need to have it tuned and try another IAC possibly.
I have one in it now.. Its better but it still starts hard. It started great and idled great for a while but now its starting hard.. It idles decent though.. I need to have it tuned and try another IAC possibly.
11-14-2010, 03:55 AM
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But.. its not stock.. it just has stock injectors. It has the cc306, -5cc pistons, 2.02/1.60s with slightly worked over heads and IM.
I may have found the issue. I fixed a few vacuum leaks and fired it up with freescan and noticed the coolant temp sensor is not readimg.
Oh and I switched the tb out for one off of a 96
I may have found the issue. I fixed a few vacuum leaks and fired it up with freescan and noticed the coolant temp sensor is not readimg.
Oh and I switched the tb out for one off of a 96
11-18-2010, 08:28 AM
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The vacuum leak was causing the revving then dying and the coolant sensor caused the hard start. I also had a bad plug wire. Fixed these issues and it runs great!
Last edited by mattcossel29; 11-18-2010 at 08:33 AM.
