1st time on the road with this car, its stumbling and lacks any power it does get up to highway speed.
I've replaced the plugs, cleaned caps-rotors, new ones on order, checked spark with inductive timing light,
checked the vacuum at idle it does seem on the low side ( 16inches )
no obvious vacuum leaks, checked fuel dampers no gas in the vacuum lines,
added textron and Marvel mystery oil to gas tank.
I pulled off the air cleaner box and found the MAF seal was just hanging on could this be my problem ?

 

Doubtful that is the primary cause of your low power. Have you checked fuel pressure? Does it run worse when the MAF connector is unplugged? Low power only when cold or even when hot? If only when low check the resistance of both channels on the Temp II sensor. Check coil wires, primary and secondary, for corrosion and make sure coil grounds are tight and clean. If you run it in a dark garage do you have fireflies from the plug wires arcing?

Mike

Mike

 

Did you check the clear relay by the LH brain to see if a red or green LED is on?

 

If you have one (and I believe you might) check the in-tank fuel pump. If it's typically got the broken hose, replace the pump with an in-tank filter from 928's R Us and life will be good.....although you might have a bad main pump too now because of it. Been there, done that.

 

Just checked the plugs wires in the dark, I do see some arcing on the passenger side, will order new wires.

 

Leds are both off.

 

Might as well get the full set of Beru wires. If some are gone the rest can't be far behind.

MIke

 

Beru plug wire set is around 400 bucks, must be made of gold.

 

Do as Hilton sugggests and check that clear relay. If either the red or green LED are lit, do NOT drive the car. (danger of snapping the drive shaft in the torque tube)

 

I checked the leds they are both off.

 

The Beru wires are complete with dist. cap ends, new resistor ended stingers for attaching to the plugs, and fully assembled with all new wire loom clips/holders properly positioned. Plus they last about 20 years. Do a search hereabouts and you will see the quality and precision details that make the price seem more reasonable.

Mike

 

Sanity check
Checked compression all are in the 180 to 190 range, plugs are brand new so its hard to tell but 2 and 8 don't look like they are firing, thats on the drivers side, the arcing wires were on the passenger side. new caps rotors are on the way already, will order the Beru plug wires today.

 

Listened with a wooded dowel on each injector all are clicking away, except #4. Will check connector for power, and replace if needed.

 

Good progress and analysis !

 

Beru full factory wire set $335 at 928sRus.