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Scary Brief Engine Misfire


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Ok this concerned me today. I never experienced this before in my 96 Deville. I was late for the Suffolk County women's high school basketball championship (Copiague vs Wyandanch) and opened it up this morning for about 20 miles of between 75 and 80. Got to the game, after the game, started the car and the engine was misfiring, choking and rough as I backed out of the parking space, when I put it in drive, it misfired for about 3 seconds and then the misfire went away. I did not get a misfire code or a flashing CEL.

It was damp out due to the warm temps yesterday and today that melted the snow. Lately I have been driving the hell out of it.

This concerned me because misfires don't just come and go and I am hoping that this is not the beginning of a head gasket problem. Temps are normal. I did I little thinking and I need to explore these items:

Fuel Pressure Regulator (replaced with AC DELCO 2 years ago)

Ignition Wires (definately bad)

Oil in Spark Plug ports

Carbon tracking at coils or bad connection at coils

Fuel pump?

Water in fuel

EGR issue (have been getting a P1406 intermittantly)

What do you guys think?, with no codes having set? Copiague won

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

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Maybe you just dislodged some carbon inside the cylinders running the old grandfather clock.

If you really want to make people safe drivers again then simply remove all the safety features from cars. No more seat belts, ABS brakes, traction control, air bags or stability control. No more anything. You'll see how quickly people will slow down and once again learn to drive like "normal" humans.

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Maybe you just dislodged some carbon inside the cylinders running the old grandfather clock.

:lol: Hopefully that is all it is, this never happened before

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Maybe you just dislodged some carbon inside the cylinders running the old grandfather clock.

:lol: Hopefully that is all it is, this never happened before

Put yourself at ease and send an oil sample to Blackstone Labs. If something has gone wrong no doubt it will show up in the oil.

If you really want to make people safe drivers again then simply remove all the safety features from cars. No more seat belts, ABS brakes, traction control, air bags or stability control. No more anything. You'll see how quickly people will slow down and once again learn to drive like "normal" humans.

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Mike,

Since you mentioned the change in temperature and humidity...my first guess would be a bad plug wire.

How old are your wires and plugs?

It is possible for the wires to get condensation in them when they cool off.

I had a Chevy 396 that ran great in Texas, but when I went on a trip to the deep south where the humidity was real high...I had to put a new set of plug wires on it.

It would miss for a three or four minutes each morning when I started it. The second day that it did it...in Mobile Alabama...I put a new set of wires on it.

That fixed the problem. :D

I hope yours is also that easy to fix.

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High speed run ????

75 to 80 ???

:lol::lol:

Give him credit, he drives a grandfather clock :lol:

If you really want to make people safe drivers again then simply remove all the safety features from cars. No more seat belts, ABS brakes, traction control, air bags or stability control. No more anything. You'll see how quickly people will slow down and once again learn to drive like "normal" humans.

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High speed run ????

75 to 80 ???

:lol::lol:

I know, I know, Warren will attest to the fact that I am a wusser, but on the Long Island Expressway 75 to 80 weaving through traffic is trucking LOL...

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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High speed run ????

75 to 80 ???

:lol::lol:

Give him credit, he drives a grandfather clock :lol:

:lol: Nice, if I recall, you were driving a great grandfathers clock up until recently :lol:

I need to get rid of this car, I have a girlfriend now, and I need something more sporty/sexy than this ocean liner.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I need to get rid of this car, I have a girlfriend now, and I need something more sporty/sexy than this ocean liner.

This is right by Bruce's house.

It should fit you real well. :D

http://www.crestcadplano.com/VehicleSearch...8&maxMPG=34

You are teasing me Jim, wow what a car for $40K... I would be stylin and profilin in that car! That IS sexy

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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High speed run ????

75 to 80 ???

:lol::lol:

Give him credit, he drives a grandfather clock :lol:

:lol: Nice, if I recall, you were driving a great grandfathers clock up until recently :lol:

I need to get rid of this car, I have a girlfriend now, and I need something more sporty/sexy than this ocean liner.

Sorry to disappoint, but a '92 Seville was NEVER a grandfather clock. Think of it more as an over-sized sports car :lol:

Listen, take my advice and don't get something that looks too much like money if this is just to impress a girl. You'll regret it if you do. Get what YOU want, if she doesn't like it she can take the bus or drive her own car. There's a white SLS or STS (didn't notice which) in the neighborhood for sale, if you want I can get the phone number on the window and you can check it out. Totally up to you.

If you really want to make people safe drivers again then simply remove all the safety features from cars. No more seat belts, ABS brakes, traction control, air bags or stability control. No more anything. You'll see how quickly people will slow down and once again learn to drive like "normal" humans.

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High speed run ????

75 to 80 ???

:lol::lol:

Give him credit, he drives a grandfather clock :lol:

:lol: Nice, if I recall, you were driving a great grandfathers clock up until recently :lol:

I need to get rid of this car, I have a girlfriend now, and I need something more sporty/sexy than this ocean liner.

Sorry to disappoint, but a '92 Seville was NEVER a grandfather clock. Think of it more as an over-sized sports car :lol:

Listen, take my advice and don't get something that looks too much like money if this is just to impress a girl. You'll regret it if you do. Get what YOU want, if she doesn't like it she can take the bus or drive her own car. There's a white SLS or STS (didn't notice which) in the neighborhood for sale, if you want I can get the phone number on the window and you can check it out. Totally up to you.

Thanks, if it looks good to you, see if you can figure out what year it is, I would need to sell my car. I think I am going to do something as fast as I can

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Spark plug cables or bad grounds/connections on anything depending on a clean connection to send a signal (apart from digital signals) ie. MAP, MAF etc.?

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Yep - if you have a P0146 (EGR) in history, than that was the cause of the stumbling. The first time mine chocked on the EGR, I had the same symptoms. It felt like I was accelerating in an old school carb car on a freezing cold night, while the engine was still cold, & I had a vacume leak. just take the EGR off, & spin the pintle with a torx on a drill.

BTW I think it is a bad idea to get rid of the '96 Deville. it's a sexy car. I still get looks in mine.

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Yep - if you have a P0146 (EGR) in history, than that was the cause of the stumbling. The first time mine chocked on the EGR, I had the same symptoms. It felt like I was accelerating in an old school carb car on a freezing cold night, while the engine was still cold, & I had a vacume leak. just take the EGR off, & spin the pintle with a torx on a drill.

BTW I think it is a bad idea to get rid of the '96 Deville. it's a sexy car. I still get looks in mine.

I have a current p1406, I need to pull the EGR off and clean it hopefully that is it. I got the stumble again tonight.

I agree its a great looking car, its just a little too big for a single guy..

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Spark plug cables or bad grounds/connections on anything depending on a clean connection to send a signal (apart from digital signals) ie. MAP, MAF etc.?

Thanks Jan, I need to check the car over, it stumbled on start up again tonight for a few seconds.. Thanks

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Aw, c'mon Mike. By this point you must know an Eldorado would look just fine on you. Why are you fighting it? Stop already!

Get "Nike" on us and just DO IT!

Here's some gleaming inspiration:

DSCF0175.jpg

Regards,

Warren :bluesbrothers:

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There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises

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Aw, c'mon Mike. By this point you must know an Eldorado would look just fine on you. Why are you fighting it? Stop already!

Get "Nike" on us and just DO IT!

Here's some gleaming inspiration:

DSCF0175.jpg

Regards,

Warren :bluesbrothers:

I know Warren you are right, I am delaying

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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How much are you thinking of spending on the next Cadillac?

I am not really sure what I can afford as my job has been intermittant. I am getting ready to go back to Miami, if things work out, I am thinking that I would like to spend up to $6000 and pick up a 2000+ ETC or STS.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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You see, I can get a nice car for the $5000 to $6000 range, Thanks Bruce

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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