Problem>>don"t know what

[pace648]

I have a 1973 porsche 914 1.7 fuel injection... and it will run but has a miss.....and when it gets hot it dies and won't start back until it cools down..i took it to a shop and the guy told me that the fuel injection was shooting gas into the cylinder to soon making it not fire at at 100% so i don't know if there is a way i can adjust my fuel injection ... and the ground and the positive cable that go on the battery are in pretty bad shape and i got the battery in the trunk because the battery pan is gone (About to put in new one) and i don't know if that has anything to do with it or not...If anyone knows anything about what i am talking about plz let me know what u think i will try anything at this point.....

sorry guys i did'nt mean to put 1974 it is a 73...i have put new plugs ,and points ,wires, cap,rotor button, basicily the whole firing system is new except the coil.... i have redone the fuel lines from front to back...the fuel pump is bye the motor

[URY914]

It's been sitting for 4 years and it doesn't run right? I'm shocked!

How about a tune up with new points, plugs, condenser, cap, rotor, wires, fuel filter, air filter to start with.

The hot start problem sounds like vapor lock. Where is the fuel pump, under the fuel tank or by the engine?

[jhora]

Do exactly what Paul suggest first...
then don't take it back to that guy in the shop...
then go here and read...
http://members.rennlist.com/pbanders/DJetParts.htm
http://rennlist.com/techarticles/djetronicfuel.htm

[racer]

What makes you think its a 1.7? '74s came with either 2.0l Djet injection or 1.8L L-jet injection. If it IS a 1.7, maybe that's an issue as well?

Post a pic or two of the engine/ engine compartment to let us see what you are working with.

Certainly need to re-baseline the car. If sitting, drain all gas.. replace stuff mentioned by Paul as well. Replace/clean ground straps. May even want to check FI trigger points, if indeed you mechanic is on to something.

There is no place to "send your injection off too"..

"hot start" issue could be fuel; it could also be a failing starter.

[elwood-914]

I have a 73' with a 1.7 and that used to happen to me all the time.
Like the guys said "relocate, relocate" the fuel pump. Problems over.

[Tidybuoy]

Regarding the "when it gets hot it dies and won't start until it cools down" comment:

Does it ever not start when hot - even after normal shutdown? The reason I ask is because 914's have a notorious hot-start problem that may be the case here - or maybe not.

I would start by getting all your tune up items in order:
1) have you replaced your vacuum lines in the past 5 years. If not, replace them all. The 914 fuel injection is critical that you don't have any vacuum leaks.
2) as stated above, replace plugs, cap, rotor, points.
3) check the condition of the fuel pump. Is it still located in it's original location (under the car - under the battery box)? If so, consider re-locating to the front trunk, under the gas tank. The factory did this on the 75/76 cars to cure the vapor-loc problem (i.e., hot start issues).

Only after the car has decent tune up parts & vacuum lines can you really start tuning the fuel injection. Any air leaks will cause "unmeasured" air entering the system and the fuel injection computer will not adjust the fuel accordingly (cause it dosen't know about the extra air). Be sure to check the gaskets under the intake manifold funners, the gasket at the throttle body, the large round gaskets that connect the runners to the central manifold, the fuel injector seals, and all vacuum lines.

Also, confirm your engine size - get the serial numbers off the top of the engine and post here.

When I replaced all my vacuum lines, it was like adding a few horsepower with each line replaced - amazing.