Hi all….had to have a new engine (or recon should I say) fitted to my new TT auto jap last October (cambelt failure on way back from Glasgow after just having bought her…..d-ough was gutted!)

After the engine was fitted the mechanic advised me that the wiring loom was very brittle. Ever since then I’ve had a hot start issue.. Also cat warning light used to come on when not being driven that hard. Have been just pootling around trying to just ease the engine in for the first 1000 miles. Recently with the good weather I tried to put her through her paces and drove the car hard.

After a bit of stick she started to misfire and is very jumpy on idle at traffic lights. Have driven her a few times round the block since and the misfiring only starts once the car has warmed up after 15-20mins.

Looking on the previous threads on here, am I correct in assuming all the above symptoms can be put down to the coilpack?

If so, can anyone tell me exactly what the coil pack consists of??? (sorry folks I love driving this magnificent machine but not so hot on the technical side!)

And if it is the coil pack, anyone know how much a replacement is likely to be and whether or not a reasonably competent mechanic can do the job or does she need to visit a specialist Zed doctor (anyone in the West Yorkshire area)?

 

Cheers guys…and long live the Zed!

missfiring when warm is usually a sign of ptu problems, try reseating and cleaning the connectors of the ptu

If you don't know where it is.

 

Engine by numbers

________________________________________

Here are some of the basic parts of the engine labled out.

 

 

 

 

1. Air Intake Hose

2. Turbo Hose

3. Power Steering Reservoir

4. C.A.S (Crank Angle Sensor)

5. P.T.U (Power Transfer Unit)

6. Windscreen Washer Bottle

7. Engine Coolant Tank

8. Fuse Box

9. 6 Coil Packs

10. Oil Cap

11. Radiator Cap

12. HICAS Solenoid

13. Radiator

14. E.C.U. Water Temperature Sensor

15. Dashboard Water Temperature Sensor

16. Fuel Filter

17. Brake Fluid Reservoir

18. Clutch Fluid Reservoir

19. Brake Servo

20. Air Filter

21. Throttle/Cruise Control Cable

22. TPS (Throttle Position Sensor)

23. Passenger Side Stock Boost Solinoid connector

24. Driver Side Stock Boost Solinoid connector

25. Driver Side O2 sensor Connector

26. Det Sensor Connector

27. Passenger Side O2 sensor Connector

28. Fuel Damper

29. Fuel Pressure Regulator

30. Balance Bar

The coil pack is basically (idiot speach) a voltage amplifier that provides power to the spark plug.

 

After checking the PTO connections (as stated above), it would be an idea to identify which cylinder is not firing. Swap coil packs and see if the 'no firing' follows the coil pack or remains at original cylinder. If it follows the coil pack after swap, coil pack shagged. If miss fire remains at the original cylinder, it is then most probably electrical, and a good start will be the PTU.

If it is the PTU try and get a series II one from a trader on here as they tend not to break down as much.

 

Ivan

Thanks all for your advise....think all electrical connections need a good clean up.

 

From memory I think the mechanic did have a few problems with the coil packs when he fitted the new engine....which is why I'm thinking the connectors have probably fried when I put the car threw its paces the other day! So am thinking they'll need replacing anyway.

 

Just been looking on fleabay....found these boyos......pricey yes but any good at all? Anyone had any experience of these splitfire direct ignition connectors?

 

http://cgi.ebay.co.uk/Nissan-300ZX-Splitfire-Performance-DIS-UNITS-Coil-packs_W0QQitemZ120218697383QQihZ002QQcategoryZ72205QQrdZ1QQssPageNameZWD1VQQ_trksidZp1638.m118.l1247QQcmdZViewItem

those are not the connectors, they are the coil packs themselves so if your connectors are shot this wont make any difference, my connectors are fairly poor, but i improved them greatly by cleaning them with a precision deburring tool and some contact grease, i would certainly try this first before shelling out loads, where are you in w yorks? i work in elland

 

Brian

Yep good call....will give all lecky connections a good clean up and see what happens.

 

I'm over in Huddersfield....along Halifax Rd so just a stones throw away from Elland

well if you need anyone to give a second opinion give us a shout, i can always pop up, i will warn you tho i am far from an expert.

Okeedokes...cheers for that Brian,,,might take you up on that ....let me see how I get on first....shall let you know if I'm struggling!