advice and insight please ...

[jigger]

Hi problem solvers are you ready . My engine wont turn more than 3-5 spins with plugs in and not starting . I had trouble with over reving found it to be a leaky throttle body i changed that and for piece of mind checked the timing all is good part from cam pully looked a tooth out (from the top of the cam cover ) adjusted that did a compression test all have 160min 185most struggled to do the test with engine stopping . battery is strong and turns engine easy with plugs out i put 1 plug in and it turns over but not easy put 2 in and it stops after 2 turns .....anyone ? the batt i am using its a little over 2 yrs old it is a optima red top 1000a 50ah. And i have a new recon starter . The car is a mk1 golf gti ( mid rebuild) thankyou .

[Momentofmadness]

Check the earth strap on the starter?

[E-bmw]

And the battery, and the engine/chassis earth, and the positive to the starter & battery & alternator.

In doing so remove them clean them & re-tighten them properly, this is the cause of most apparent starter/battery issues.

[GreenV8S]

Check the voltage across the starter motor when it's struggling, and check the battery voltage under the same conditions.

If you have 9V or more across the starter, you probably have a starter motor problem.

If you have less than 9V across the battery, you probably have a battery problem.

If the two voltages are different, you have a solenoid or wiring problem.