linderpat

my 85S has a weird issue at start up - it always starts, but it always seems like it doesn't want to. Turn the key, the starter whirs, and then catches, and then the car feels like it is about to stall - the revs drop real low, then the idle catches and it settles in to a nice steady idle. Sometimes it takes a crank or two, and some foot on the gas pedal to keep the idle from dropping off and stalling. The car drives great otherwise.

Thoughts? Battery? Grounds? ISV going bad?

FredR

Have you replaced the main earth strap in living memory. I had a similar experience a year or so ago, replaced the ground strap and the engine immediately turned over quicker and fired up much more positively.

The strap appears to be vulnerable at the ends where the braid is fastened to the lugs- open the heat shrink and you may see signs of corrosion and broken strands.

9two8

^ ^ ^
+ one, also check out the main engine to chassis earth lead.


Ken
80 928 S
5 Speed

UK

Mrmerlin

check the vacuum lines to the dampers/FPR for fuel

linderpat

no vacume issue, the lines are all good. I think ground as well. What about ISV? What are sypmtoms when that acts up?

Mrmerlin

if no fuel in the vacuum lines,
then swap in a new ISV,

has the MAF ever been rebuilt?
how about the age of the temp 2 if its old then.
is the O2 sensor original if all of the parts are original.....................

then it would be good to swap them,
also do a new CPS

Snark Shark

I'm curious if you were working on the car before this problem started.

linderpat

No; it has been like that since I picked it up last summer. It starts up easier the warmer outside it is. The car has had almost everything redone, though, based on the giant stack of receipts I got with it, including a top end refresh.

I will attack the grounds first and see what result I get.

Mrmerlin

also see the TPS short harness, for a cracked end.

the temp 2 sensor and/or connector if either one looks old replace.

linderpat

Thanks Stan.