my 3800Sc swap into 87 GT, the car starts and runs Great, WHEN it it still in OPEN LOOP. once it warms up, the idle gets rough. Haven't driven it more than a 1/2 mile at a time (not registwered yet). it always starts right up runs like a bat out of hell all through 1st and second(never got farther than that), but right around the time I'm putting it away ( It's just about 140-160,degrees, the idle gets crappy) what am I needing to look at ? motor is bone stock, ALL NEW, 1997 Riviera automatic. Thanks
You really need to occasionally scan to check KR and Fuel trims.
They are probably not the culprit but just because they are new doesn't mean they are without issue. Especially if they are from Auto Zone. I have received a few defective products from them.
I "Do have" a Hand Held OBD2 Scanner, but that doesn't list "fuel trim" or anything like that as far as i know. it just says if there are any codes. maybe I'm wrong, happened before. LOL
You are going to want to use a scanner that at least can monitor O2 sensor voltage to see if it is burying rich or lean. However I can tell you that 3800s are picky about any vacuum leaks. Small ones can cause it to idle like crap once the PCM stops cold enrichment. Yes while running your battery voltage should be above 13v. If you voltage drops enough, it will run like crap.
First time you took it out was fun wasn't it. Even running like crap, the're fun.
Fun ?, an Understatement ! What are you other guys Experience with the 4t65 Trans ? It seems like it was hitting 60 in 1st gear at 5000RPM ! I was busy watching the Road to do more than a glance at the Tach and speedometer. what speeds are Normal Wide Open Throttle Shift Points ? It must have some "Unreal Top End" !
I first had a series 1 on a 4T60e now a series 2. Same trans(oh well). They can be over revved easy. You hold your foot there it well shift late. All of that is controlled in the programming. When I first looked at the shift to TPS tables in an editor, all I could say was, damn. When I put it together I kind of knew what to expect. Since he helped I took it to my brother in law, just to say try this. On ramp to I95. He steps on it, says damn, lets off, says, I like this. I told him to look at the speedo. Another damn. He had no Idea we were just under 100. Few weeks ago took a fellow worker for a ride. He had been eagerly watching as I was getting parts together. He had transfered away and came back. I told him that the engine was in and running. Want to go for a ride? 2 blocks we were at 50. He said do that again and I well get sick.
Fun ?, an Understatement ! What are you other guys Experience with the 4t65 Trans ? It seems like it was hitting 60 in 1st gear at 5000RPM ! I was busy watching the Road to do more than a glance at the Tach and speedometer. what speeds are Normal Wide Open Throttle Shift Points ? It must have some "Unreal Top End" !
More like hysterical insane fun. Stock shift points are 5300rpm @ 44mph in 1st Stock shift points are 5300rpm @ 83mph in 2nd Stock shift points are 4700rpm @ 113mph in 3rd
I love the 4t65e trans. The gearing is perfect for the motor. Paddle shifters would be nice but I was ok with just tweaking the shift point programming to my liking. I was getting to 53mph @ 6K rpm in 1st. Even spanked a nissan GTR in first with the gen III M90 so you know it was a rocket.
1998 3800SC . Got a NEW Alternator. Now it charges at a full 14 volts even with the Headlights and the AC On. BUT, the Volt "LIGHT" in the Gauge is ON, Bright, and won't go off ! What do I need to check Now ? thanks
There is a ground from the "Alt mounting to the body", 3 from the" body to the engine", 1 from the" body to the frame", 2 from the "engine to the frame". ( I "Think" I've got that covered) LOL are there any "Hidden ones" for the gauge LIGHT ?
Wow I guess you do. I don't know anything about the gauge ground but if it was me I would check the alternator connectors since that's the last thing that was dis-connected and re-connected.
Especially if they are from Auto Zone. I have received a few defective products from them.
