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HT4100 4.1, 4.5, 4.9 Discussion, Fuel Injectors 94 Deville 4.9L in Cadillac Engine Technical Discussion; You know, you can check the injector operation somewhat with a stethescope. You can hear it. Listen for the ticking. ...
  1. #46
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    Re: Fuel Injectors 94 Deville 4.9L

    You know, you can check the injector operation somewhat with a stethescope. You can hear it. Listen for the ticking.

    Do you have a timing light? Connect it to #5 and see if it is triggering the light.

    Are you missing a tooth on the pickup coil in the base of the HEI? If so, it will miss forever and you will never be able to fix. Look for the 8 poles on the dist shaft inside the distributor. Make sure all 8 are there.

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    Re: Fuel Injectors 94 Deville 4.9L

    Since that cylinder is on the front bank I would do a compression check if you havent done one. I would do one even if you have done one just to make sure. Your beating a dead horse if a a valve isnt working properly. The one directly next to it is cylinder 7, do one on it and then one on five.

    Blaze

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    Re: Fuel Injectors 94 Deville 4.9L

    Quote Originally Posted by adalla
    0.06 is the gap
    Is this right?

    Blaze

  4. #49
    DFBonnett is offline Cadillac Owners Fanatic
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    Re: Fuel Injectors 94 Deville 4.9L

    Quote Originally Posted by youbetcha77
    Is this right?

    Blaze
    Yes

  5. #50
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    Re: Fuel Injectors 94 Deville 4.9L

    Quote Originally Posted by N0DIH
    If you start hearing any tapping at all, that is a good sign that they are pretty bad. You can take them off and look, but find out the proper torque to torque them back, do not guess!! Use a torque wrench!

    In my opinion, any car over 100K is worn enough to replace. Probably the only way to check is to get a new one and measure it compared to an old one. They are aluminum with steel arms rubbing on them with lots of force. It wears fast...
    why do i have a bad feeling thats the valvetrain noise im getting ....

  6. #51
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    Re: Fuel Injectors 94 Deville 4.9L

    Can you connect a volt meter across the injector connector contacts?
    You should see readings on the AC scale. DC will be erratic, AC should be smoother, and a decent reading, around 1-2 volts. The dwell meter might read better yet. Put on the 6 cyl scale.

  7. #52
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    Re: Fuel Injectors 94 Deville 4.9L

    Quote Originally Posted by Stoneage_Caddy
    why do i have a bad feeling thats the valvetrain noise im getting ....
    They aren't a hard swap, probably harder to get the valve covers off...

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    Re: Fuel Injectors 94 Deville 4.9L

    im just worried about putting the rocker trees back in ...i hear thats pretty easy to screw up

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    Re: Fuel Injectors 94 Deville 4.9L

    I did all of them on my Olds 350, which I suspect is nearly an identical twin to the Cad HT series. Very easy. I would recommend making sure the arms are wet with oil and that you use an accurate torque wrench.

    It looks like the only area to mess up is overtorqing or cross threading. Olds went into the head direct with a fine threaded bolt. Cadillac bolted more like a wood bolt into the alum arm support. So if you cross thread, you have to get a fatter bolt that can dig in or replace the support. The pivots are what wears. Olds had some issues with breakage (mainly 86-up when engines went to Mexico). But most really need replacing >100K just due to wear. Being it is a hydrailic lifter, it tends to keep quiet, but once you replace it, you will be amazed how much more quiet it is.

    The catch the FSM says, and I would do it for sure.

    "REMOVE THE ROCKER ARM SUPPORT WITH ROCKER ARMS AND PIVOTS ATTACHED AS AN ASSEMBLY AS THE PIVOT ASSEMBLIES OR SUPPORT BAR THREADS MAY BE DAMAGED IF PIVOT BOLT TORQUE IS REMOVED AGAINST VALVE SPRING PRESSURE"

    This is likely where people have gone wrong on these engines.

  10. #55
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    Re: Fuel Injectors 94 Deville 4.9L

    Quote Originally Posted by N0DIH
    I did all of them on my Olds 350, which I suspect is nearly an identical twin to the Cad HT series. Very easy. I would recommend making sure the arms are wet with oil and that you use an accurate torque wrench.

    It looks like the only area to mess up is overtorqing or cross threading. Olds went into the head direct with a fine threaded bolt. Cadillac bolted more like a wood bolt into the alum arm support. So if you cross thread, you have to get a fatter bolt that can dig in or replace the support. The pivots are what wears. Olds had some issues with breakage (mainly 86-up when engines went to Mexico). But most really need replacing >100K just due to wear. Being it is a hydrailic lifter, it tends to keep quiet, but once you replace it, you will be amazed how much more quiet it is.

    The catch the FSM says, and I would do it for sure.

    "REMOVE THE ROCKER ARM SUPPORT WITH ROCKER ARMS AND PIVOTS ATTACHED AS AN ASSEMBLY AS THE PIVOT ASSEMBLIES OR SUPPORT BAR THREADS MAY BE DAMAGED IF PIVOT BOLT TORQUE IS REMOVED AGAINST VALVE SPRING PRESSURE"

    This is likely where people have gone wrong on these engines.
    Just set the rocker bridge on there and get the bolts started. They should thread easy once they start correctly. When they are started tighten each one in one turn increments switching back and forth. Like tighten the left one a turn and then the right and then the left again and so forth. They are known for stripping out or busting when someone runs the bolt down on one side and then cocks the whole bridge one way. Then they tighten the other side and snap, goes the bridge. Stick to that and you should be fine. IN Oldsmobile V-8's like 350's and 307's these are notorious for making a lifter sound. I heard one engine sounded like it was flat coming apart. Sounded like it had no oil and wouldnt make it another 5 minutes on idling and come to find out we replaced all the bridges and it was as quiet as a new one. It was my brothers car actually and it was a 83 Cutlass coupe with the 260 V-8. Same thing as a 307, just smaller.

    Blaze

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    Re: Fuel Injectors 94 Deville 4.9L

    Im still leaning toward this injector because I did put a used 1 in and when i pull that plug it does smell of gas slightly right after i run it but its not dripping or anything but i dont know if it should be. Maybe its extremly weak or just bad. As far as checking the compression i dont think im able to correctly....I can barely get my hand in the back of the engine let alone take spark plugs out. I was told i need all of the plugs out to do a proper compression test. I did do 1 earlier in this thread i was informed it was incorrect but by the way i got 195 on that 1...lol. Since i changed the dist cap and rotor the car definatly runs better but still not 100% obviously. Now the idol seems to be high when i first start it up...it revs up a bit and then lowers down...rpms are around 1000 after it lowers down. any ideas?

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    Re: Fuel Injectors 94 Deville 4.9L

    I would replace the injectors with a ford set from a 91-up Town Car, Crown Victoria, or Grand Marquis. Make sure the top of them is orange.

    Blaze

  13. #58
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    Re: Fuel Injectors 94 Deville 4.9L

    from the junkyard

  14. #59
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    Re: Fuel Injectors 94 Deville 4.9L

    you have told me this once before i will pull a set next time im out there. thanks

  15. #60
    DFBonnett is offline Cadillac Owners Fanatic
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    Re: Fuel Injectors 94 Deville 4.9L

    Quote Originally Posted by devilleman1024
    Ok I pulled the spark plug and yes it does smell of gas and looks wet. I also put the plug wire right up next to a solid ground and no spark. I even switched 5 wire with 7 just to see if I got a bad wire and still no spark. I think im gonna run to the auto parts store and pick up a dist, cap and rotor.
    Let's get back to the basics, fuel and fire. Seems like #5 plug is not getting spark and all the others are. You are sure #5 plug is good? If so pull #5 wire off the dist cap. Connect a battery jumper cable to a good ground, start the engine on 7 cylinders and hold the other end of the jumper near #5 on the cap. Any spark? If there is spark, the problem is a bad wire or bad plug. If no spark the problem is with the cap (unlikely because new cap made no change) or internal in the distributor. The only thing inside the distributor that is cylinder specific is the pick-up coil. Not likely but possible.
    FWIW
    YMMV
    DFB

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