Question about 1996 Cadillac DeVille

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Hard to start when it's cold outside, put in new plugs, checked the wires, replaced map sensor, cleared codes still have problem, could this be a bad coolant sensor even though it reads correct temp

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  • fhibb85 Feb 05, 2010

    just to shed more light on the problem once it starts it picks up the idle right away and as long as I dont let it sit all day it will start just fine after that first time in the morning.

  • fhibb85 Feb 05, 2010

    yes the information is very helpful I have been working on this problem for atleast a month.

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Yes It is possible since the fuel system (computer) reads the temperature and allows the system to run richer on cold start. A weak coil or low compression (nothing broken, just wear) also contribute to this somewhat. Plug gap can be reduced about 5 thousandths to compensate for that to some degree. You can also clean the internal cross wires in the mass air flow sensor with carb cleaner and a Q tip which may also help.

Posted on Feb 05, 2010

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Why would an 2005 Town and country van with a 3.8 engine start and sound/run good for a couple of seconds and then starts missing real bad.


Crankshaft position sensor maybe , throttle position sensor , coolant temp. sensor etc.... It could be a lot of thing's . Instead of buying this part an that part ,take it an have it diagnosed . To a good ASE certified repair shop . Unless you like buying unneeded parts .

Mar 29, 2016 | 2005 Chrysler Town & Country

1 Answer

Code po107


Just because your getting a code from a sensor doesn't mean the sensor is N/G. The MAP sensor reads the manifold air pressure, that can be anything from a vacuum leak, elec short, bad plug/wire, miss, gasket and the list goes on. It can be a bad sensor too, don't get me wrong. Does it run rough, hard start, did you ck the emissions? First things first Vacuum leaks & gaskets are popular. Once in a while I cross paths w/ a cracked manifold. Don't throw your $ out the window, Do it once & do it right. Good luck

Oct 24, 2015 | Cars & Trucks

1 Answer

My 1993 dodge shadow died and wouldn't start back it turns over but won't spark. When I turn the key I get the code 355 or 13 What does this mean


Check the codes again- there are only 2-digit codes. Code 13 is saying "MAP sensor is not detecting any change during self-test". It could be a bad MAP sensor (Manifold Absolute Pressure-the vacuum sensor for the engine), but sometimes it can be a wire harness problem. If a new or known-good Map sensor doesn't fix it, you will need a mechanic to check the MAP sensor circuit.


Usually when an engine dies and won't restart, it is a gas or spark problem. Listen for the fuel pump to turn on with key in on, not start-it should turn on for about 2 seconds to put pressure in the fuel line and up to the engine. If the pump is working, next check for spark at a spark plug wire, with the engine being cranked over. If you have a blue, snapping spark, the ignition is probably good. If no spark, it could be a bad ignition coil, a bad Ignition Control Module, or possibly a bad Crankshaft Position Sensor.

Oct 06, 2014 | 1993 Dodge Shadow

1 Answer

When its very cold outside my 2003 corolla will not start just changed plugs and temp senser we can put a heat light at the firewall by the temp senser for 30 min or so and she will usally fire.


wow, no engine option stated, !!!

how cold is cold, we dont know, ALASKA -50F or Keywest at +80F

what temp sensors , there can be many.

my 08 has 3 on engine,. one in tranny, and 1 in front corner for my outside airtemp option with compass.



the one that counts is the ECT, and this sensos is screwed deep

into the waterjacket or in the thermostat housing, vastly hard to heat up by hand that. for sure heating up the thermal mass of and engine

with a heat lamp is near impossible. so where is it. EXACTLY.



are you running old fuel.?

running summer fuel?

Is CEL (MIL) lamp glowing when it does run?????





hard cold starts are caused by many things.

Just too cold is one (spend time in alaska and see)

Weak spark, check it at each

you connect scan tool, early in the morn. and see if the ECT and IAT

read near the same and near outdoor (where car is parked) temperature. if yes, he ECT and IAT are working.

once started the ECT will rise to 180F or more and hOLD; does it?

if in fact you did by change warm the ECT artifically and start easy

that means the engine is flooding.

my guess is you didnt do diagnosis at bad start time.

(spark tips soaking with fuel) leaking injectors on one or more cyl?

check all sparks for flooding, not just one,

if it is flooded, the operators guide says (RTM) top crank with the throttle held open and this cuts fuel and flood engine starts.

other causes aplenty

too high fuel pressure

leaking injectors

weak spark at any cylinder, got P030x DTC codes from scan tool?

weak compression on any cyl. (sticking valves? cold) (gage it)

if the engine is good, good compression that leaves 2 more.

weak spark (if all spark plugs are strong cranking) then....

or bad fueling,



bad fueling can be.

bad fuel

leaking injectors, (for 3 reasons)

ECU is overfueling, (ECT reads way too low than reality)

The engine has 2 more sensors that can cause over or under fueling

THE MAP or MAF, you didnt say which engine so cant guess.



MAP vacuum port clogged with PCV cloud of death , gunk,.

MAF hot wire coked up, clean it.

the maf coked will cause lean starts.

the mAP can fail 2 ways, stuck at high or low pressure.

stuck high is way more common, this causes flooding.

there are other reasons.



1: EGR main stuck open ( bad news. it floods the intake with exhaust gases and that really wrecks combution to start any engine.

2: ISC stuck closed, (flooding)



or a MAF based engine with any form of induction leaks (vacuum leaks)



i think i hit them all (hope), and there are tests for each case.

ask.

Feb 06, 2014 | 2003 Toyota Corolla

1 Answer

Pontiac Aztek 2001 - 3.4l (non-GT); Codes: P0135, P0141, P0420 all O2 + Converter. Ideas on problem?


P0135 bank 1 sensor 1 open or short in wires,bad connections,bad sensor ,or bad ecm. P0141 bank 1 sensor 2 same diag as P0135. P0420 cat below threshold open or short, or faulty Ho2s sensors.you may have several problems. start with sensors circuit if good change sensors if not trace to ecm if reading not right replace ecm if all good replace sensors clear codes retest drive two drive cycles for cat to clear tests. then with no dtcs present test fuel pressure , injectors,then ignition system ,timing valves ,map,maf sensors,throttle sensor,crank sensor cam sensor, compression.

Aug 02, 2012 | 2001 Pontiac Aztek

1 Answer

Symptoms of a bad map sensor on 93 cadillac fleetwood brougham


Well code 23 is a faulty signal from the manifold air temp sensor. The sensor is telling the computer the air temp in the intake is out of range compared to the other readings.
Code 26 is a quad driver problem inside the computer.
Code 34 is a MAP sensor signal saying the vacuum is high when it should be low compared to the other sensors.
They may be connected or separate issues. You could check the MAP with a vac gauge.
I would clear the codes and see which ones come back again.

Jul 21, 2012 | 1993 Cadillac DeVille

1 Answer

I have a 05 Dodge ram 1500 90,000mi. and it start to bog and eng.light came on my codes were p0129-p0405-p0340-p0868 and pending codes were p0129-p0325-p0330-p0405-p0340. I had put a new map sensor in...


P0340 is for camshaft position sensor circuit malfunction so the problem can be in you hav already changed sensor, then you need to check wiring from sensor to ecu and if the wires are ok than check the ecu! It can be either of them cousing the problem.

Jan 30, 2011 | Dodge Ram 1500 Cars & Trucks

1 Answer

99 ML430 143k miles, had codes for misfires on cyl 4 and 5. Replaced ignition coils to clear codes, now hard to start from cold. Had p0100 code MAP sensor, found cracked/open vacuum hose, replaced hose....


P0100 OBD-II Trouble Code

Technical Description

Mass Air Flow (MAF) Circuit Malfunction

Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.

You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness.
Causes

A code P0100 may mean one or more of the following:

* The MAF may be disconnected, or a wiring connection may be bad.
* The MAF sensor may be faulty.

Possible Solutions

Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back.
Then start with the cheapest, easiest repair procedures:

* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires.
* Unplug and reconnect the MAF wiring harness a few times to clear the contacts.
* Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information).
* Replace the MAF sensor.

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Sep 17, 2010 | 1999 Mercedes-Benz M-Class

1 Answer

1997 jeep grand cherokee runs rich after long trips


Could have a bad map sensor. The Map sensor is located on the throttle body. I have seen countless Jepp that start blowing black smoke when they go bad. That would be a good starting place.

Sep 12, 2008 | 1996 Jeep Grand Cherokee

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