2002ls1a4

I installed a Fuddle 3400 1.8str converter over a year ago and everything was fine until about 2 months ago. It just quit locking up at 40 mph where I had it set to do. I also installed a shift kit and it was tuned with HP Tuners. At first I thought it was because of the colder weather but we just a 60 degree day and still it wont lock up. Any ideas on what to check? It has not set any codes.

performabuilt

iTrader: (25)

If you have a tuner/scanner first I would look and see if the PCM is enabling lockup or not. Normally if lockup commanded and does not happen you will get a code P01870 thats why I say veryfy its being comanded first thing

FLT

iTrader: (1)

Was the shift kit recently installed? I have seen the transgo kit installed incorrectly and cause a converter to not to lock up properly because the regulator valve was installed incorrectly. Just a thought. Vince

2002ls1a4

Shift kit was installed the same day as the converter. All I have right now is a code reader so I cant check to see if the pcm is commanding lock up or not. I did just now go and check for codes and still dont have any. Would it not set a code if the pcm was messed up and not sending a signal for lock up to happen?

performabuilt

iTrader: (25)

It might not there are several conditions that may not set a code but wuld cause the PCM to not comand lockup, Engine missfire, Coolant temp sensor to low , are a couple.

daniel6718

iTrader: (36)

anyone been able to reach them lately? been calling for a week in a half now cant get ahold of them

performabuilt

iTrader: (25)

Maybe they are jusy partially open or doing the holiday thing, I know our shop will be closed all week this week, Will reopen monday, Christmas break. Of course ill be working as allways all week ,

2002ls1a4

Engine missfire codes were tuned out and I thought if the coolant temp sensor read different than actual temp for a certain period of time it would set a p1114 or p1115.

performabuilt

iTrader: (25)

I am not sure on that, I do know I have seen cars without thermostates i the winter like mine that cant get to 140 and it never goes into lockup but also never sets a code, But at the same time as I said normally if the PCM comands lockup and it dosent happen you should set po1870

2002ls1a4

I still have the stock t-stat in it, but the fans are set to come on at a lower temp. I might try and pull tie a piece of cardboard over the trans cooler to see if that does anything assuming that it is a low trans temp issue.

performabuilt

iTrader: (25)

Trans temp shouldnt affect it, If you would like a simple test to see if lockup is being comanded shoot me and email at performabuilt@yahoo.com

2002ls1a4

From what I understand trans temp needs to be 100 degrees or more lockup to happen. Im still learning though and could be wrong.

performabuilt

iTrader: (25)

Once again I am not sure, I know engine temp has to be near 130-140 degrees to allow lockup .I am not tuner so have never looked at wether the trans needed to be at any particular temp , But I have seen some cars with realy large stand alone coolers in very cold weather still have lockup when the cooler barley felt warm.

2002ls1a4

email sent

performabuilt

iTrader: (25)

Reply sent

2002ls1a4

Thank You sir. I will give that a try.

2002ls1a4

Well, I performed the test suggested by Performabuilt and the PCM is commanding lockup. It still doesnt have any codes, fluid is full and clean and trans shifts good with no noises at all. Just no lockup. Does this sound like the converter clutch went out?

2002ls1a4

anybody?

85mudblazin

iTrader: (7)

Same thing just happened with my Fuddle.

Truck drove and shifted great it just wouldnt lock up.

I have HP tuners so I hooked it up and it showed around 300rpm of slip. PCM was commanding lockup but nothing was happening.

I called John and he said so send it back in and they will cover everything.

I pulled it out and put the stocker back in and lock up works great now, so it was in the converter.

Ill send it back to them after Christmas.

performabuilt

iTrader: (25)

Well thats test will verify that the PCM is indeed comanding lockup , That only leaves you with a few possibilites, But if it was a sudden thing I would have to go with some issue with the converter.