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79 Eldorado: stay running..black smoke..new plugs, wires..timing chain

Customer Question
I have an 79 Eldorado...
I have an 79 Eldorado that will not stay running it seems to be getting way too much gas it will start and idle but the exaust is black smoke and gasses you out in a few seconds. We Put in new plugs, wires, timing chain temp sensors and some time ago a used computor. Any help?
Submitted: 5 years ago.Category: Cadillac
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Answered in 16 hours by:
6/6/2012
Cadillac Mechanic: Neal, Cadillac Mechanic replied 5 years ago
Neal
Neal, Cadillac Mechanic
Category: Cadillac
Satisfied Customers: 8,351
Experience: Shop Owner and Mechanic on multiple makes.
Verified

Hello I'm Neal and I am here to help resolve your issue. If I cannot help I will opt out and refer your question to another expert.

-

Have you replaced the o2 sensor? Have you made sure the catalytic converter is not the problem?

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Customer reply replied 5 years ago
Neal: Thanks for trying but I think we need someone that would have worked on these cars when they were popular. The car was not equipped with an 02 Sensor and the convertor was replaced with a test tube years ago. They made the test tube for that reason.
Cadillac Mechanic: Neal, Cadillac Mechanic replied 5 years ago
Sorry, don't see many of those anymore!!! I will opt out and see if someone else can help.
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Cadillac Mechanic: jazzmaster, ASE Certified Tech replied 5 years ago
jazzmaster
jazzmaster, ASE Certified Tech
Category: Cadillac
Satisfied Customers: 2,951
Experience: ase certified--32 yrs experience
Verified

hi, my name is XXXXX XXXXX I will try to help you .

since you have done all that ,I dont see a mention of a tps sensor or egr valve.

try this first see if the egr valve is stuck open and check to make sure that there is no vacuum going to the valve at idle .

if that is good

then unplug the tps sensor on the throttlebody and see if that makes a difference.

these are about the only things that would make it run rich ,besides perhaps a big vacuum leak ...jazzmaster...

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Customer reply replied 5 years ago
The EGR Valve has been blocked off and the TPS has been unpluged which should put it in canned mode.it makes no difference. just black smoke.
Cadillac Mechanic: jazzmaster, ASE Certified Tech replied 5 years ago

did you check for a vacuum leak?

also can you take off the vacuum to the fuel regulator and see if it is wet from fuel or fuel coming out of the pressure regulator?

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Customer reply replied 5 years ago
This is a repair facility and we have checked for all vacuum leaks, fuel pressure is 43lbs. Fuel pressure regulator doesn't have any leaks. With vacuum unhooked it goes to 55lbs. Put a noid light on injectors and all are firing as normal. When we take the plugs out they are soaked with fuel. Spark is normal. We replaced ignition module. Pretty much stumped at this point.
Cadillac Mechanic: jazzmaster, ASE Certified Tech replied 5 years ago

wow ,that is weird let me think about this and I will get back to you very soon .jazzmaster ...

I am going to research this and I seem to remember having a vehicle like this awhile back ,be bcak soon

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Cadillac Mechanic: jazzmaster, ASE Certified Tech replied 5 years ago

I am thinking perhaps the map sensor or circuit .

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR

The manifold absolute pressure (MAP) sensor monitors pressure changes within the intake manifold which are the direct result of engine load, speed, and barometric pressure. As pressure in the intake manifold increases, additional fuel is required. The MAP sensor sends this information to the ECU/ECM so that the length of time the injectors are energized is increased or decreased accordingly.

The sensor is mounted within the electronic control unit. A manifold pressure line is routed with the engine harness and is connected to the front of the throttle body at one end to the MAP sensor at the other end. .

check to make sure that the vacuum line to the sensor is not broke or not getting vacuum to the sensor

you have checked and done just about everything else ,this is the only other thing that would give you the issue you are having and makes sense ...jazzmaster...

jazzmaster
jazzmaster, ASE Certified Tech
Category: Cadillac
Satisfied Customers: 2,951
Experience: ase certified--32 yrs experience
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jazzmaster and 87 other Cadillac Specialists are ready to help you
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Customer reply replied 5 years ago
The map sensor is in the ECU and we p[ut a used one on it and made no difference but that don't mean it's not bad also. I have checked to get this one rebuilt so to make things more simple I will accept your answer and cancel the rest of the subscription. Thank You.
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jazzmaster
jazzmaster
jazzmaster, ASE Certified Tech
Category: Cadillac
Satisfied Customers: 2,951
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