dobbo Posted 9December, 2019 Report Share Posted 9December, 2019 I've had a cold start problem for a while and determined the thermo time switch was faulty.(was the short type) So I decided to change coolant at same time(a bit over 2 years old) obtained a TTS(it was the long type) and set up to drain coolant out of rad and engine block. The radiator drain plug fouled a metal tab so I flexed the rad over 5mm to clear removed engine plugs changed TTS refilled and tested. Coolant leak under bellhousing investigated and found a cracked plastic heater tap and while under car noticed the engine earth strap running over exhaust and under heat shield was getting worn through. I rerouted strap over the heat shield and under steering rack ordered and changed heater tap, refilled tested drove car for three days(cold start problem still there) no leaks. Day four coolant leak at RH plastic tank and rad core when I flexed the rad(rubber mounted) I pushed on the RH tank disturbing this 40 year old seal. Radiator repairer would not guarantee repairs new rad over $1000 had to use Nulon stop leak which has worked well. Back to original problem if I ground the W terminal going to TTS motor fires straight away(the best its ever started) ground the G terminal starter motor will not operate however dash lights on. I'm getting voltage on both terminals when key turned to start( not sure what voltage exactly) am going to clean 14 point plug next any advice welcome. Quote Link to comment Share on other sites More sharing options...
ANF Posted 9December, 2019 Report Share Posted 9December, 2019 It goes on a bit, but may be of help? https://rennlist.com/forums/928-forum/354242-cis-k-jet-cold-start-issue-5.html Quote Link to comment Share on other sites More sharing options...
dobbo Posted 14December, 2019 Author Report Share Posted 14December, 2019 Thanks ANF am going down the voltage drop path. Will check and clean connections and see how it goes. Quote Link to comment Share on other sites More sharing options...
dobbo Posted 19December, 2019 Author Report Share Posted 19December, 2019 Cleaned 14 pin connecter(was nothing wrong) and found a redundant relay had been fitted to the wire coming from pin 14 and going to the starter motor solenoid aha smoking gun, alas no. Removed relay and rejoined wire( I wonder what po used it for) but made no difference. Will continue with trouble shooting when time permits. Quote Link to comment Share on other sites More sharing options...
dobbo Posted 14February, 2021 Author Report Share Posted 14February, 2021 Tidied up some wires under the motor and cleaned some earths and found a wire off terminal 50 on the starter motor alas no fix. Turned out I applied sealant on the TTS when I replaced it which gave a too high resistance that was the problem now fixed. slamdanke, ANF and bear924 3 Quote Link to comment Share on other sites More sharing options...
XLR8 Posted 16February, 2021 Report Share Posted 16February, 2021 Good to hear you got there in the end. My 924 renovation has been 3 times the learning experience I had anticipated! I know I am not alone (924s are very simple compared to 928s). bear924 1 Quote Link to comment Share on other sites More sharing options...
bear924 Posted 17February, 2021 Report Share Posted 17February, 2021 I chased a cold start problem for ages ... ended up being a loosish connection on my coil. Frustrating yet very satisfying when you score a win. Quote Link to comment Share on other sites More sharing options...
dobbo Posted 28September, 2021 Author Report Share Posted 28September, 2021 Trouble again I've been doing a few little jobs during lockdown. My horn wasn't working(after market wheel) so I resoldered a broken wire back on the steering wheel hub. While I had the iron out I thought I would tidy up the wire coming from the 14pin plug where PO fitted the relay(see above) unfortunately when I refitted the plugs back together it broke in my hand and wires 1and 2 fell off due to corrosion. Wire 1 went to voltmeter which I bypassed wire 2 was for oil pressure but still worked(PO must have bypassed it) and the plug is now held together with zip tie. Is there a better solution to the 14pin plug or should I purchase new plug and pins from the States? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.