HELP!! Having problems with a 930 motor
 

I put a 78 euro 930 motor in my 71T. This was supposed to be a good running motor with no issues. When I drive it at constant throttle 2k-3k it misses and cuts out. Full throttle fixes this until 3.5k and then it cuts out and falls on it's face. I can put it in 3rd at 1.5k and it runs fine building boost and at 3.5k and 7lbs of boost it cuts out.

The car has both pumps installed, MSD, and no overboost for the pumps(they run with the ignition on). It has new plugs, wires, cap, and rotor.

I did just have the rear pump on thinking that maybe it was because I wasn't using the front, but that didn't solve it. Thought maybe plugs, but that wasn't it.

When I first got it running it was idleing over 2k so I lowered it to around 1k, but it seems like it's creaping up abit now.
As far as wiring the engine harness all I did was wired power to the red/white wire, same as the 78 SC motor I had before.

I will take the filter off next.

So can anybody point me in the right direction? It's beggining to get frustrating. I'm to the point I wish I had the 3.0 and webbers back in it.
Thanks, Mark

Sounds like fueling issue. Check basic CIS 101 troubleshooting (control pressure readings, vacuum leaks, air-flapper moving freely, voodoo rituals, sacrifice small animals etc.)

maybe you have the distributor vacuum retard still getting vacuum off of idle. is the CO set around 4%?

I too would be immediately curious of the vacuum ciruit on the distributor. Personally I would start with that and then the rest of the ignition system.

Just my .02..................................C:)

How do I check the vacuun on the distributor? I don't have anyway of checking the CO. Thanks guys for the help so far.

I would first start by disconnecting vacuum from the distributor and plug off the vacuum line. If the problem goes away then you know you have an issue with the vacuum circuit of the distributor. Also first verify that you actually have vacuum at the hose to the distributor by simply checking it with a mechanical vacuum gauge.

You may also have a fuel filter issue this is simple to check by removing filter and trying to blow air through it with your mouth in the direction of flow. If you are not able to easily pass air through the filter, then considering you can only get about 7 psi from your mouth the pumps will have a hell of a time passing 60 + psi through the filter. Solution. Replace fuel filter. Unless you already have.

One more possibility is the fuel injectors them selves. If the engine you purchased was sitting for an extended period of time there is a good chance the injectors could be partially plugged up and have poor spray patterns. You could do a fuel injection service or add a GOOD in tank fuel system cleaner like a commercial product such as BG chemical companie's "44K". If you cant find this product and you need some I can help you there. PM me, the stuff is a miracle worker!

Hope this helps you out............................C:)

ok, the distributor is getting vacuum. i pulled the line of and the idle dropped considerably. i checked the filter and it's fine. so what next? thanks, mark

I'll be sleeping on this rudy. I will get back with you tomorrow and hopefully help you nail this problem down.

.................................................. ..C;)

Did you drive the car with vacuum disconnected? There is a plate in the distributor that the pick up rides on. It rotates around as the vacuum actuates it. If the wires are broken there is a possibility that you could have an intermittant connection to the ignition pick up. I have also had to replace the short harness connector on the outside of the distributor because it was intermittant. This is an area where these wires are subjected to some pretty severe temperatures from the turbo.

Long story short. If you disconnect vacuum and drive the car and the problem is gone, then the above described problem could very well be there. Since vacuum is not there and the plate and wires are not moving then the connection has a better chance of staying constant.

The next thing to be suspicious of might be the CD box. I however dont know if that is something that responds like this or if it just quits working. I have never (Knock on wood) had a problem with mine.

Let me know if this helps. Im sure I can think of some more things to look at.

.................................................. ...C:D

With the line off I revved it to 3k and still cuts out. I know what your talking about the plate moving in the dist, it happened on my 3.0. I will pull the cap off and check it to make sure.
The thing is it runs fine wide open from 1.5k to 3.5 in 3rd gear. Part throttle at cruising speed cuts out.
The msd box is hooked up exactly like it was on my 3.0 and never had any problems.

Ok I'm back from Indiana and I need to get this thing figured out. The fuel line comming out of the filter was kinked. I replaced it, still same problem. I thought maybe the filter was bad. Replaced it, same thing. The only other thing is it seems the alternator is not charging good. It's showing around 13v. I don't think this would affect the ignition system, but maybe I'm wrong. I checked the WUR and it is getting power. Being a 78 Euro motor it's pretty basic. I'm getting quite pissed after spending 9k on a motor and trans and it runs like crap. Is there anybody in the South West Washington area willing to give me a hand? I'm to the point of selling this motor and putting a VW motor in my car, or just walking away from it completly.
Thanks, Mark

i guess you made it back, thanks for the return phone call.....

Mark, Have you checked the basics?

Fuel volume/pressure

compression

timing


You have to actually have to test these systems in order to find out is wrong with them. If fuel volume and pressure check out, there is nothing wrong with the lines and filter. You then move on to the fuel distributor and other components. Buy, rent, or borrow the test equipment needed to solve your problem.

nevermind. Fixed the problem. I wired the msd box like a read on a post. The 2 trigger wires were crossed. I changed them and it hauls ass now. The thing is I checked the wireing multiple times. I was reading about msd boxes on here and noticed the wiring was different than what I had. Thanks everybody for the help.