98Z28CobraKiller

iTrader: (17)

Yeah, that's the one.

I got the exhaust bolted up but it is still backfiring at start up alittle. It takes a while to get on and if I leave it at like 2000 rpm for a couple of minutes, I can ease down to 1500 before it starts wanting to die.

I spoke to a friend that has autotap. He said that he will let me borrow it so I am going to grab it tonight and see if that tells me what is going on. Any ideas?

I think that I am going to start a new thread on resolving driveability and tuning in the tuning section. I will post the link.

98Z28CobraKiller

iTrader: (17)

Moving to the Tuning area to get thru the next part.

I hope that this thread helps many!

https://ls1tech.com/forums/showthrea...37#post4171537

98Z28CobraKiller

iTrader: (17)

One more thing with regards to the actual engine install. After getting it fired up, I noticed that I was leaking oil pretty badly. It is dripping from the bolt on the back drivers side of the pan (not the long skinny one) that is wedged between the oil filter and the bellhousing. I spoke to a friend that has a 402 also. He just blew a tranny and pulled his out. He noticed that his clutch was soaked in oil and a little oil was pooling in the pilot bearing. He took out the pilot bearing and discovered that his leak was coming from a plug that goes into the center of the crank behind the pilot bearing. I hope that this is not where my oil is coming from. I am going to hold off on locating the leak until after I get my tuning software and can get it idling good. Stay tuned!

DrkPhx

iTrader: (15)

I would jump on that leak asap before doing anything.

98Z28CobraKiller

iTrader: (17)

Hmmmm. I'm not worried about it right now. I don't have a lift and doing this kind of **** on your back is for the birds. Once I get the software for tuning, I am going to trailer the car to my buddies house and put it on his lift. There I can evaluate the problem and resolve it. I am not driving the car with a leak.

I am going to post my Autotap findings as soon as I get down there and scan and log. I think that I have a bad O2 but I need to scan it again as I thought that Autotap would save my results but once I brought the laptop upstairs, I couldn't get to the info and trouble codes. I am still learning about this diagnostic ****.

DrkPhx

iTrader: (15)

Did you name and save the log file?

98Z28CobraKiller

iTrader: (17)

No but I will try today. I will post my trouble codes. I extended my O2 sensors myself and I was getting codes for those. Not sure though if the codes were from the front ones or the back ones that aren't plugged in.

Will the back ones only throw a code or will they prevent the PCM from going into closed loop and thereby add to the idling proiblems?

macky

I notice that you said that you extended the o2 sensor wires yourself. I have heard that can cause problems. You should definetely splurge for the real deal o2 wire extensions.

Dave

98Z28CobraKiller

iTrader: (17)

Yeah, I ordered them the day before yesterday. I should have them soon. Still curious as to whether the missing rear O2 would prevent going into cloesd loop.

SILVERZZ28

iTrader: (3)

good write up

KRAZY K 2000 TA

iTrader: (5)

this is asking for a littlle effort but i to am preparing to buy a SDPC 402 LS2 was wondering if you could compile a parts list of things needed for this conversion any help is greatly appreciated.By they way great write up!

98Z28CobraKiller

iTrader: (17)

I suggest that you call SDPC or e-mail them and ask what you will need. The SLP package that I purchased is not the same and may require different items. If you read thru the whole post and take some notes, I cover pretty much everything step by step and includes notes as to what items were included and what items I had to come out of pocket for. Good luck. I am still waiting for tuning software from HPTuners.

tones2SS

WOW!!! Awesome post!!! I wish I had half the knowledge you have on putting together such a nice engine. GOOD LUCK!!!!!

KRAZY K 2000 TA

iTrader: (5)

did you get your idle problem fixed?cause i was looking at your pictures of your ported throttle body,and it looks like you epoxied the hole for your IAC idle air control shut.Meaning no idle

KRAZY K 2000 TA

iTrader: (5)

tried to post a pic of the IAC hole for idling but can get it

98Z28CobraKiller

iTrader: (17)

I probably had less knowledge than you do right know when I started out. I did alot of research and got alot of help from the people on these boards. I also had to spend some $$$ on tools but now the tools have paid for themselves and all future do-it-yourself work is free.

I have been hanging out in the tuning section now trying to get it running nice. I have made great strides learning and understanding the HP Tuner package. When I first fired her up, I could have cried cause it ran so shitty. Know it is coming around and running alot better. I have to work out a couple of little issues and I will then post a write up on that aswell.

98Z28CobraKiller

iTrader: (17)

I did drill out the IAC. I think that it is just hard to see in the pic. I did get the idle under control (for the most part) by turning in the idle screw and doing the disconnect turn the key and reconnect in order to reset the TB % back to zero. I am having a little bit of trouble with the IAC keeping up when I first start the car. I am trying to work on the idle airflow tables to smooth this out. I may need to drill a bigger hole for the IAC though.

98Z28CobraKiller

iTrader: (17)

Well, I decided to bring this post back from the dead as I feel like now I am really finished (until I start to change stuff). I have had ALL kinds of problems.

Once I got done with this thread, I moved over to the tuning section trying to get it running right. What I didn't realize was that my cam was in wrong the whole time. I got on the dyno and was very dissappointed.
https://ls1tech.com/forums/showthrea...ht=started+402
https://ls1tech.com/forums/showthrea...ht=started+402

Then, once I got those issues worked out I ran into this problem.
https://ls1tech.com/forums/pcm-diagnostics-tuning/496901-code-p0601-showing-up-after-i-incorrectly-flashed-my-pcm-w-new-2bar-sd-hptuners.html

Finally, I got to this problem which I just resolved.
https://ls1tech.com/forums/pcm-diagnostics-tuning/498799-i-can-t-seem-lean-her-out.html

This is the real end of this thread. I hope you all enjoyed it. I didn't.

King James

iTrader: (13)

So is it all good now?

Mrbowtie26

iTrader: (3)

Do you plan on bringing it back to the dyno to get final numbers ? And if so when. Also, you have a PM.
Thanks
Ron H