Question about 1986 Cadillac Eldorado

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1986 Cadillac Problem

Had a garage install a new distributor cap and rotor now th Caddy over revs before shifting. It hangs up in low and second but if I lift my foot it sometimes will shift righ then. Whats wrong? Changing a cap and rotor should'nt have anything to do with shifting should it?

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There is a "throttle valve" cable located on the throttle linkage of the carburetor that may have been reset or left unhooked when you had it serviced. Check to make sure it is connected to the throttle link.
Also behind the carburetor there is a vacuum line connected to the intake manifold that goes to the transmission vacuum modulator, they may have knocked it loose or the hose cracked.
Check it out and let me know.
Regards,

Posted on Mar 08, 2009

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Hello,

I understand your problem, and I will try and give you the best advice here of what to do.

Yes, most likely when your son installed the distributor cap/rotor the screw might have been stripped some or just loose. And yes over a period of time they can work them self off, mostly because the rotor itself is the moving part. The distributor itself if screwed down correctly does not move, but the rotor inside of course does move.

The best way to solve this, and to make sure this works correctly, is to purchase a new distributor cap and rotor, reason for this is, then the screw will be new and do not have to worry about possible stripped where rotor tightens down. It is possible he might even cross threaded them, which is still better off to buy new rotor and cap (they normally come with the screw if not , have them match them up to fit) Just need to give like AUTO ZONE, the make, model, engine and they can hook you up. Now I realize you can use old cap and rotor, but problem is this, because it came off and so forth, why take the chance of the rotor or cap getting banged up, and then will could have some electrical issues, sense there plastic and only takes a small hairline crack to cause problem. best to replace both and then secure down snug. Almost any garage, or a friend that has a couple screw drivers and some knowledge can do this for you for like a cold beer. I hope this helps you, and I think this will be a easy, low cost solution. Thanks Mike from Fixya.

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Your vehicle may be equipped with either of the following ignition systems, depending on the year and engine combination:
* 1981-82 1.3L and 1.6L engines: Dura Spark II Ignition System
* 1982-85 1.6L Non-EFI and 1986 1.9L Non-EFI engines: Thick Film Ignition I (TFI-I) System
* 1983-90 1.6L EFI and 1.9L EFI engines: Thick Film Ignition IV (TFI-IV) System

  1. Disconnect the negative battery cable.
  2. Remove the distributor from the engine.
  3. Place the distributor assembly on a workbench.
  4. Remove the two TFI ignition module retaining screws.
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Do not attempt to lift the module from the mounting surface, except as explained in Step 3, as the pins will break at the distributor module connector.


To install:
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  2. Position the module on the distributor base mounting flange. Carefully position the module toward the distributor bowl and engage the three connector pins securely.
  3. Install the retaining screws. Tighten to 15-35 inch lbs. (1.7-4.0 Nm), starting with the upper right screw.
  4. Install the distributor into the engine. Install the cap and wires.
  5. Reconnect the negative battery cable.
  6. Recheck the initial timing. Adjust the timing, if necessary.

Hope helps.

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Hello Macstff ;

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Looking from the top near the Passenger side fender . If we know that the Number 3 Plug is more inline with the vacuum advance then moving " clockwise the next plug would be the # 5 and after that would be the # 1 plug

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