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76 cadi eldorado help needed
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warthoglew
New User
Oct 7, 2012, 2:38 AM
Post #1 of 7
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76 cadi eldorado help needed
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I have a 76 cadi eldorado with fuel injection. She was running fine, then she started to miss. A few minutes later she started to misfire. A couple of minutes after that she started to misfire explosively. I've had a couple of mechanics look at her andthey are scratching their heads. Any ideas??? Any help would be a blessing....
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warthoglew
New User
Oct 7, 2012, 11:01 AM
Post #3 of 7
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Re: 76 cadi eldorado help needed
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Let me clarify what I mean by misfiring -- By misfiring I mean backfiring. When I said explosive misfiring, I meant that she backfired so hard that I thought she'd blow the cylinder head off. I hope that clarifies it a little..
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 7, 2012, 11:13 AM
Post #4 of 7
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Re: 76 cadi eldorado help needed
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Yes, that is a quite different explanation. A misfire and a backfire are 2 entirely different things.
I would replace the distributor cap and rotor to start with if you haven't recently been messing with anything in the ignition system. You could have a problem with the ignition module or pick up coil but try the cap and rotor first.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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warthoglew
New User
Oct 7, 2012, 11:52 AM
Post #5 of 7
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Re: 76 cadi eldorado help needed
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This is one of the few that came off the line with fuel infection -- an option that year. Part of the problem is that not alot of cadi's had that option. My understanding is that GM used a Jaguar design on the fuel injection (never a good idea). None of the mechanics in my area has ever worked on a car like this -- either they work on older Cadi's or the newer ones that talk to you better. This is an inbetweener.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 7, 2012, 11:54 AM
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Re: 76 cadi eldorado help needed
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What does any of that have to do with a distributor problem?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 7, 2012, 11:55 AM
Post #7 of 7
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Re: 76 cadi eldorado help needed
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My era and my type car but not much help from direct experience with these. Just notes on older American Iron if you will. This one was already on the chopping block to end production not long after '76. Call it what you or they did a 472 (501) same idea but fuel injection was funky. I think it just sprayed 4 times for all eight cylinders unlike some that are one for one. I doubt that would cause backfire like that.
Never mind that a ton of these were bought up as just Sunday drivers especially the convertibles loaded to the gills. Can still find them never registered for use here and there.
Can't know but probably a nylon cam timing gear. Miles or not they were trouble if ever run normally to full temps back to cold over time would just crack up.
It may have run fine two seconds before and all off time but still phart away with no warning and some could jump right back on time (no freaking clue how) and behave like nothing wrong!
To check try if any reasonable idle to get an actual vacuum reading "Teed" into intake actual vacuum and or, turn crank bolt looking at timing marks turned to TDC held right there from turning that direction and remove distributor cap to look at rotor. Note how many degrees crank can turn the other way before rotor turns. 5-6 degrees if balancer is marked well enough is pushing the limit. Basically you are just turning a crude bicycle chain idea one way and the other to guess how loose or worn it is because you can't look right at it.
If you can find a timing light (need one) see it it jumps around if it idles worth a damn at all.
It's just something fairly easy to rule out. Again - I won't be much help with some other controls unique to just the Eldo. Far as I know all the DeVilles were the same carb set up engine that ended in '76.
Good luck. Here to try. Good news is parts should be no problem for this,
T
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