Land Rover Repair: Disco not starting after changing Distributor Cap and Rotor, rotor arm, alignment marks


Question
John-
We have the same Dicso, a 95/ 3.9.  The check engine light and came on after I had a tune up for my newly acquired Landy.  The shop guys wanted a lot of $$$ for changing the Distributor Cap and Rotor, so I said no but let the change the plugs and wires.  I ran around for 2 plus weeks like that and decided to switch it out this weekend.  I printer the firing order and replaced the wires one by one.  With the new rotor and cap in place I had spark in and out of the cap but the engine will not start.  Sequentially replacing the old parts and tripe/quadruple checking the positioning and order of the wires we now can not get the engine to turn over with all the previous parts intact.  I read where you said the TPS could be off.

Could this have happened by simply changing the wires?
What are your suggestions?
Also where can I get a ODB reader for my 95?

Cheers,
~

Answer
Hi Makenna,

so you replaced the dist.cap and rotor.  Did you have any problems removing the rotor?  Here's what I suggest:

below is the LR instructions for removing and refitting the distributor.  Read this and see if you missed anything.  Although you did not actually remove the distributor, it does tell you what can go wrong if the dist. is misaligned in any way.

You could even redo your cap and rotor with these instructions.  Send me an email and I'll send you this techsheet with the graphics.  It shows the wire sequence on the plugs and dist.

DISTRIBUTOR - V8i
Service repair no - 86.35.20
Remove
1. Disconnect battery negative lead.
2. Disconnect vacuum hose.
3. Remove distributor cap.
4. Disconnect low tension lead from coil.
5. Mark distributor body and centre line of rotor arm.
6. Add alignment marks to distributor and front cover.

NOTE: Marking distributor enables refitting in exact original position, but if engine is turned while distributor is removed, complete ignition timing procedure
must be followed.

7. Release distributor clamp and remove distributor.

Refit

NOTE: If a new distributor is being fitted, mark body in same relative position as distributor removed.

8. Leads for distributor cap should be connected as illustrated.

Figures 1 to 8 inclusive indicate plug lead numbers.
RH-Right hand side of engine, when viewed from rear.
LH-Left hand side of engine, when viewed from rear.

9. If engine has not been turned while distributor has been removed, carry out instructions 10. to 17. Alternatively proceed to instruction 18.

10. Fit new ’O’ ring seal to distributor housing.
11. Turn distributor drive until centre line of rotor arm is 30° anti-clockwise from mark made on top edge of distributor body.
12. Fit distributor in accordance with alignment markings.

NOTE: It may be necessary to align oil pump drive shaft to enable distributor drive shaft to engage in slot.

13. Fit clamp and bolt. Secure distributor in exact original position.
14. Connect vacuum hose to distributor and low tension lead to coil.
15. Fit distributor cap.
16. Reconnect battery.
17. Using suitable electronic equipment, set ignition timing. See Adjustment, Ignition timing
18. If engine has been turned with distributor removed, carry out instructions 19 to 30.
19. Set engine-No. 1 piston to static ignition timing figure See ENGINE TUNING DATA, Information, Engine 3.9 V8i
20. Turn distributor drive until rotor arm is approximately 30° anti-clockwise from number one sparking plug lead position on cap.
21. Fit distributor to engine.
22. Check that centre line of rotor arm is now in line with number one sparking plug lead on cap. Reposition distributor if necessary.
23. If distributor does not seat correctly in front cover, oil pump drive is not engaged. Engage by lightly pressing down distributor while turning engine.
24. Fit clamp and bolt, do not tighten.
25. Set ignition timing statically to 6° B.T.D.C.
26. Connect vacuum hose to distributor.
27. Fit low tension lead to coil.
28. Fit distributor cap.
29. Reconnect battery.
30. Using suitable electronic equipment set the ignition timing. See Adjustment, Ignition timing

Regards,
JohnMc
jmcinnis64@hotmail.com