What's funny is almost 10 years ago I bought a CPI 4.3 to replace the 4.3 in a boat I had (spun a bearing) - and up until about 1 year ago I had that spider injector kicking around because the pintles/tubes were all in such good condition.
I haven't pulled it apart, supposedly if you pull the intake top half off you can see it. I'm guessing it's a simple butterfly valve that opens/closes to allow additional air in.
I have no reason to crack open the intake manifold, so for now I'm not going to.
After looking at this, I...
Putting this here as a note to myself....
95 vortec CPI motors have an "Intake tuning valve" - which is an open or closed valve that allows additional airflow around 2700 rpm.
Sounds like TVIS, and I believe that would be an easy workaround with MS to control...
It's a tent trailer, the ad seems legitimate but not getting any responses from the seller. They have an address listed phone, and email - I tried email and phone.
As for the engine - I just rummaged around....
I have a spare connector for the injector. TPS is the same as the 350. I can...
Ehh, I'm not sure it's worth it to go so far as check angles. It's going to be a quick stab-in of thicker gaskets and if it works, awesome - if it doesn't, slotting the 4.3L to go in.
Mentioned previously, I have a 4.3L CPI vortec V6 that has less than 4k miles, has a new spider injector, and...
I ordered a set of (reasonably priced) thickest intake manifold gaskets I could find - a set of Felpro race gaskets.... just to hopefully get more material between the heads and the intake. Hoping I can disconnect as little as possible to do the job. We'll see about that.
That, and checking...
I agree.
The engine I bought from a friend ~5 years ago. It came from a running/driving truck that seemed fine. However I've had constant running issues with it. As the story goes it has a cam and "had a bunch of work done to it" - back in the late 80s.
When I resealed the engine - tearing...
Playing with the 40 this weekend and it isn't looking good. I'm on the verge of yanking the 350 (and MS) and throwing in the 4.3L with complete harness and a new pump in.
Megasquirt isn't the problem - it's doing exactly what it should. It's tuning as expected. If I lean the curves out, the...
Haven't had much time lately to dedicate towards the 40 (septic issues, and I'm literally digging 1/4 our yard up, newborn, puppy, work)....
Took it on a short trip to the store - it ran horribly. Realized almost as I got there it was out of fuel.
Pro-tip - autotuning your VE maps when out...
it was noisy because it has over-fender headers made of thin metal, leaking collectors, at least 1 of the gaskets at the head was broken, and the mufflers were crappy "turbo sonic" from the late 70s. I wasn't saying the engine was noisy from a bad tune/timing.
The bad revving is probably...
So an update.....
Things have been busy around here (we bought a 100 series, been doing some work with that, we got a GSD puppy, and wife is 9 months pregnant - literally past her due date as I type this) so the 40 has taken a backseat.
One of the "issues" is that the vehicle is too loud for...
Ignore the mods that were displayed above, and if you do anything like this yourself - ignore the HEI upgrade kit. I don't understand (at all) how it's supposed to work - and for me, it didn't. Not even remotely.
Now.... on to what was actually done.
As I mentioned previously, the HEI...
Super hardcore tip for the hardcore section.....
sometimes coils need a good ground, and your coil wires need to have a good connection.
Spent nearly an hour trying to figure out why it would crank and run with the starter, playing with timing, but wouldn't stay running. Clipped the ends of...
So progress!
Not happy with the 'promise' that comes with the DIYAututune HEI kit of it being easy. The instructions just don't make sense.
For instance - they have you wire the 5V v-ref to pin 6 (as I mentioned above). Well if you go back a few pages in this thread, you'll see that I...
For anyone following, I'm now sort of "typing out loud" and curious on your thoughts, while I impatiently wait for a response from diyautotune.
The instructions for the Hall/Opto and the triggering off the coil negative seem very different when you initially read them. That's why I went with...
Finally got some more time to work on it, a little bit.
The modifications to the ECU don't seem to be working - it isn't getting any kind of signal from the distributor. I know it, and the new coil, are wired properly as it's sending spark and the tach (gauge in the car) is registering while...
Well..... technically the chain cover and oil pan are re-installed.
The Felpro Permadry one piece oil pan gasket set is a nightmare to install... at least in this vehicle. It comes with plastic studs which are supposed to be screwed into the 4 corner bolts of the oil pan - then push the gasket...
Back to the project (have had some delays with life happening)....
I got the diyautotune kit - the instructions I found were a bit vague - did some research and just went for it. We'll see how it goes. I originally had the pins and wires on the bottom of the board but the case didn't clear...