OldCadTech

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OldCadTech last won the day on August 26

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About OldCadTech

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    CaddyInfo Participant

Profile Information

  • Gender
    Male
  • Location
    Washington State

Previous Fields

  • Car Model and Year
    1998 Seville STS - 2002 Seville STS
  • Engine
    Northstar 4.6L V8 (LD8/L37)

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  1. @Jesse B Switch the relay with one of the other relays of the same kind. Does everything operate normally? Did the noise stop? If you still have a noise I would suspect an A/C programmer and/or a temperature blend door actuator as @rockfangd suggested. Check ALL the fuses!! Something caused the wire to burn, a short to ground is the most common. Trace the wiring issue to it's source.
  2. Okay, now that you straightend me out on the optispark system, I was still thinking distributor at the rear of the engine, sorry. The optispark was not as reliable as the regular shaft driven distributor and earned several infamous names. SO, in short, replace the optispark and do the tune up. I think you'll get the smile back!! I'd go reputable, quality aftermarket for the optijunk (oops) Opti-spark......
  3. Sounds a lot like the fuel pressure regulator is defective or there is a restriction in the sending unit/fuel pump assembly. To me, the foaming of the fuel would indicate the pump is sucking air. Since the fuel pressure regulator is non serviceable, replaceable yes, were you disassembling the fuel rail? When you replaced the fuel pump did you replace the screen/filter at the pump inlet (commonly referred to as a sock)?
  4. I guess the first question I have is - has the vehicle ever had a tuneup ? The mileage would indicate a tuneup is past due. Plugs, Cap, Rotor, wires. Coil if it is burnt or the button is bad. Replacing the distributor seems a little extreme. You say you went from a tip-in hesitation to a "crumble", does that mean miss? There is a base timing, and the computer "controls" the timing from there. I doubt very much that the timing is off if it has been unmolested.
  5. I've always taken them out the top. Mainly because I never liked pulling transmissions. And it seemed to me like waayyy to much work to drop em out the bottom. I don't remember seeing the procedure in the 98 FSM (that I gave away) either, but I had been taking the engines out since '85, so I never really looked either. I guess the question is ... do you have access to a lift? - twin post works the best IMO but center lifts can be used... Do you have access to a "cherry picker"? The engine comes out over the rt fender. It is going to take some sepecial extensions and swivel sockets and it requires lifting and lowering the vehicle several times.
  6. Usually a tip in hesitation is caused by a throttle position sensor. Not uncommon and relatively inexpensive to repair. Personally, I would clean the throttle plates and bore and see if that improves the condition.
  7. The vacuum pump may not have been on the 1990. The 1988 or 1989 with the 4.1 may have been the last year for the pump.
  8. @TedK This is one of the hardest codes to diagnose. We nicknamed it the 800 line cuz ALL the modules use it. As you probably know it can be caused by ANY module on the 800 line or any combination of modules. You have started down the right path, as checking grounds is the first step to perform. The parts department at the dealership I worked at would let us plug and play modules as this was the only way to determine the defective module. The codes you have are of no help as the rule of starting with the lowest code first does not apply with this 800 line malady... The ground I would start with is behind the drivers kick panel. Look in the FSM at the grounds section and the locations section to determine locations. Personally, I would start with the pass key/security module as most of the others (except the PCM) would allow the vehicle to start but they would set a hard code and turn the light on.
  9. Do a OBD code check first... Black smoke from exhaust? Sounds like too much EGR maybe. @BodybyFisher
  10. Sounds like the ignition module is getting hot if it is a crank-no-start condition... If it isn't cranking/turning over refer to what barczy01 suggested. The ticking in the distributor area could be a worn distributor shaft, not common but it can happen...
  11. Rock, I sold the 98 and the FSM with it. I had a preliminary edition, I will look for it,
  12. @BodybyFisher Thank you ! I think I did another post on the inlet removal a while back???????