Question about 1991 Cadillac DeVille

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Mat sensor will start but if hot will die and wont keep running

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Are you getting a trouble code for the sensor ?

Posted on Jul 10, 2013

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Posted on Jan 02, 2017

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Keep getting fault codes 12 & 23 on 93 Olds Bravada already replaced Manifold Pressure Sensor and Intake Air Temp Sensor


The code 12 usually just means the system is in diagnostic mode. The code 23 should be for the mat system, not map.

Mat is manifold air temp.
Are there any driveability issues? Does the vehicle start and run ok?

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Car Surges then dies at a stop only in hot or warm weather


Think about what you just said. Only does this in times of higher temps out BUT never in winters cold. Doesn't that seem strange to you. Well I guess it does, huh. Anyway, know these systems helps. When engine is started, the temp sensor tells the computer it needs to place the engine to cold start mode. It does this and extra fuel is put into the cylinders to keep it running like a choke on the carbureted engines. But those you can turn the choke off or it does this automatically from the warmer engine. If in fact the temp sensor is not telling the computer it's warm enough to be taken out of cold start mode, it keeps dumping excessive fuel into the cylinders an flooding the engine causing it to surge and then die, because it's flooded. Therefore, the temperature sensor is faulty and needs replaced. Do that and drive on.

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96 Dodge Runs fine but after warms up it dies,cools n will crank n run good then dies again after warming up.


Hey Dennis,, DON"T BECOME A PARTS REPLACER..(some people who "call themselves mechanic's" are just that!),.. .take this Dodge to a qualified professional... talk to them..
You say warm... do you mean full running temp?? .if so, you may be experiencing a vapor lock,, fuel "boils" when the engine is hot.. when it cools its no longer hot enough to cause this..(S.W.A.G.)

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1 Answer

Not wanting to start when its hot


Sounds like the crank sensor or ignition module. I would try the crank sensor first. It is cheaper and usually the problem.

Jul 03, 2010 | 1988 Oldsmobile Delta 88

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Stalls when warm 95 camry


sound like your have the bad distributor, when you have trouble starting remove the distributor and have the auto part check it.

Nov 23, 2009 | 1995 Toyota Camry

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Runs cold, but dies when up to temp.


Crank sensor. When it cuts off again spray some water on it and see if it will start.

Jun 05, 2009 | 2002 Pontiac Grand Prix

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No start when hot


ignation control mogule,wen get hot expend and lose conection and will not start after cool down start normal also will cose no fuell presure fuell pump will not run,locatiom under coils.replece it

Mar 13, 2009 | 1991 Buick Skylark

1 Answer

Car keeps dying


Trouble Code 33 and 34 are the MAF/MAP Sensor Circuit. It sounds like you've replaced that sensor already. Did you also have the code 34 before putting in the new sensor?
Or did this code start after it's replacement? Any other codes appearing?

Troubleshooting it would depend if it has the Speed Density Update. The dealer should be able to provide that info.

Here's your fault code list:

13 oxygen sensor circuit 14 coolant temp sensor circuit (high temp) 15 coolant temp sensor circuit (low temp) 21 throttle position sensor (TPS) circuit (high signal) 22 throttle position sensor (TPS) circuit (low signal) 23 manifold air temp (MAT) circuit (low temp) 24 vehicle speed sensor (VSS) circuit 25 manifold air temp (MAT) circuit (high signal) 31 wastegate solenoid electrical circuit 32 exhaust gas recirculation (EGR) circuit 33 mass air flow (MAF) circuit (gm/sec high) 34 mass air flow (MAF) circuit (gm/sec low) 41 cam sensor circuit 42 C3I EST or bypass circuit failure 43 electronic spark control (ESC) circuit 44 oxygen sensor circuit (lean exhaust) 45 oxygen sensor circuit (rich exhaust) 51 PROM error 52 calpak error 55 ECM error

Aug 07, 2008 | 1989 Buick Regal

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