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2003 4.0 sportrac that stalls out ,it cranks back up again if i return key switch back to off position and crank again.when motor runs rough it makes clunking noise almost as if firing back through intake system. i brought it to auto zone 4 code check and got a lean and rich code on 02 sensors on front of motor. ck engine does not come on at all..also ? ac pump comes on and off without being in on positioni

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  • 52 Answers

Have transmission codes checked. It is most likely a bad torque converter or converter solenoid in transmission.

Posted on Feb 10, 2014

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Molson02536
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SOURCE: check engine light

It might but what exactly are the codes. Before you change the Mass air flow sensor, try cleaning it first with a can of mass flow cleaner.
If your running a oil K&N filter, there could be some oil residue on the sensor. Start with that and change the filter or clean it if it's a K&N.
The O2 sensor's could be bad also, you really need the code's to be sure what sensor is giving you the faulty signal.
Good luck and hope this helps.

Posted on May 05, 2009

dttech
  • 4803 Answers

SOURCE: misfire code, rough idle, full tune up complete,

The black soot on the plugs means that you are running extremely rich. The fuel injectors ma test good electricly, but they are notorious for leaks. The spider-looking thing sandwiched between the plastic intake plenum and the intake manifold gets cracks in it's "legs" and leaks fuel ito the plenum area. The fuel pressure regulator is also housed in this same assembly. if the diaphram in the regulator gets a pinhole in it, it also leaks fuel into the plenum area, causing all kinds of erratic idleing, black smoke from the exhaust, and will cause your fuel trims to drop into the negative 20s.

There is a technical service bulletin covering this subject. This procedure outlines the steps required to replace the existing Central SFI Fuel System with a new MFI (Multiport Flexible Injection) Fuel System.

It is removing the injectors which are all housed in the center body of the injector assembly and replacing them with a new version where the injectors are located where the ols "poppets" used to be in the intake manifold ports. The picture below is for a V-8 engine that is covered by the same TSB.052d4ba.gif
The poppets and the pressure regulator are available individually to fix your existing fuel injection system, but I gave up on that after replacing several poppets only to have them come back in a few months with another popet line broken. I recommend replacing the whole assembly with the new and improved version. My customers have told me after doing this that the engine never ran that smooth when it was new.

The GM part number for the new injector assembly for your V-6 engine is 12568332 it is also now available at several aftermarket parts outlets.

As for the timing chain solution posted by doodieman200, all I have to say is that I have enough fingers on one hand to count all of the failed timing chains I have replaced on these engines. If you don't have a cam/crank sync code, the timing chain has definitely not slipped a tooth.

Posted on Oct 18, 2009

Testimonial: "thank for tech update. due to working in a fleet bus shop i no longer get regular tech bulletins"

SOURCE: Engine stalls driving down the road or on take

Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system. During cranking, the timing is controlled by the ignition module and the ECM grounds the EST line. It expects to see no activity on this line at this time. When the ECM enters EST mode, it applies +5 volts to the BYPASS line and expects to see voltage variations on the EST line.
Reasons for the ECM to set Code 42:
1. System in BYPASS mode (i.e. EST line supposedly grounded) but activity sensed on EST line
2. System in EST mode (i.e. BYPASS line driven with +5 volts) but no activity seen on the EST line

Possible causes include:
1. BYPASS line is open or grounded
2. EST line is open or grounded
3. Poor connections between ignition module and ECM
4. Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise
5. Faulty or incorrect ignition module
6. Faulty ECM
7. Faulty Pick Up Coil
8. Faulty Ignition Control Module
9. Faulty Crank Sensor or the Crank Sensor magnet probe could be cracked

Posted on Jan 15, 2011

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I have a 03 kia sorento that i just changed the timing belt and water pump on. It drove fine for about 10 mins but then stalled. After 15 mins it starts, runs for 10 mins, rough again and stalls out.


run fault codes
check for wiring on crank shaft position sensor or cam position sensor/s
it will be something that was affected by the belt replacement procedure

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A rough running Jeep wrangler


cranks ok> / not stated, and is 100% #1 key fact.
ill guess (daft) it cranks OK.
so check fluid levels(oil tops list )
then fuses.we test them.
then scan it.
all modern cars same. deal.

if it dont crank, "my starter is silent or just clicks)
then that be a horse of a different color.
dead battery ? charge system failure,
starter bad?
PRNDL (p/n switches bad )try cranking in neutral yet
my wrangler is 6 speed stick with a clutch switch
that too, is different.
even green battery lugs,.got those?

will not crank
or cranks perfect but will not start
which is it??????????????????????????/

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Having trouble with engine killing or running rough even after it's warm.


not for sure but it could be your cam sensor. if the check engine light is on then take it to a parts store and they can run a scan and give you more information

May 11, 2014 | 1993 Buick Riviera

1 Answer

Act like out gas when you first start it


stalls (or misfires) tune up time, ever heard of a 60k mile service?
and get and injector balance test, sounds like they leak,
and the starts are doing so from the flooded state.

no crank.
repeat that again. the key switch has many posisitions
no (this era) car cranks, in the non run or start position so?
my guess, is the start position (spring loaded it is) is intermittant
and when starting you wiggle key , in the ST posistion and the starter
motor wakes up. this is a bad ignition switch, which love to go bad
with huge key rings, (heavy)
if car is A/T tranny, wiggle the shifter any time it dont crank
and, try starting in Neutral (fresh switch contacts there)

Stalls is a 2nd symptom and if the dash lights dont die.
then is not related to the ignition key switch.
that is the 12vdc power system is good and the EFI/engine has issues
try a tune up first. (its in the operators guide read that)

after tune up and drive 20-50 miles
now using any newer OBD2 scan tool scan the PCM.
got DTC'S? post them. DTC are ERRORS.

Jan 12, 2014 | Jeep Grand Cherokee Cars & Trucks

1 Answer

My 2004 dodge ram turns over but sounds like is not getting fuel what can i do


I know I had the same problem with my 2004 3500 Cummins...try turning the key to the crank position and let it go (this will allow the fuel pump to run for about 25 seconds, basically priming the pump). Try starting the truck again, if it cranks over and sounds rough this is normal. Let it run until it goes back to normal. If you cannot crank the truck over keep repeating the process above (making sure you turn the key to the off position after each time you try). **This information I found out of my Chilton Dodge Repair Manual**

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1 Answer

2002 ford expedition- clicking from the relays inside car


If your saying the starter motor won't crank, make sure the battery has a full charge.
Note the starter components picture, If that is what you have, I'd check the starter relay switch. It appears to be underhood--firewall or rear of fender lining, passenger side.
See the two large lugs, that should be battery voltage to and from relay switch. The smaller terminal should be feed from crank position of ignition switch.
In the past on different makes and models I have used a large screwdriver to short between the two large posts at the relay switch, to see if starter motor will crank. If you try this, make sure tranny is in park or neutral and parking brake is set.
I may be coming in the back door to diagnose, but, It should lead to same place.
starter motor component-uodptyxnilejhphbqlyt4ykv-3-0.jpg

Apr 28, 2017 | 2003 Ford Expedition

2 Answers

03 grand am 3.4l no crank at all. All the light on dash work good fuel pressure starter spins and engine starts and then stalls when jumping the starter directly installed new pass lock switch and...


If the Passlock switch has been replaced, the computer has to "learn" the new Passlock code. You will need to hook up a battery charger to perform the learning process. (It takes about 30 minutes with the key in the "ON" position and it will run the battery down.)

Step 1:

Turn the key to the "START" position and release to the "RUN" position. The "SECURITY" light will be flashing. After about 10 minutes, the light will stop flashing.
.
Step 2:

Turn the key "OFF" then back to the "RUN" position. (Do NOT try to crank it yet) The light will start flashing again. Wait about 10 minutes for it to stop flashing.
.
Step 3:
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Turn the key "OFF" and back to "RUN" one last time. The light will be flashing again. This time, when it stops flashing, do not turn the ignition off. Instead, turn the key from the "RUN" position to "START". The engine should start and run. The computer has now learned the new Passlock code.

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Feb 08, 2011 | 2003 Pontiac Grand Am

1 Answer

2003 dodge pickup 5.7 hemi motor ---- driving along fine stoped at stop light it started to run rough , then stalled ,it started back up then stalled again . now it will roll over ok but will not...


your problem sounds fuel related chk your fuel pressure. or simply turn key off then to on position (engine off) and see if u can hear your fuel pump run (2-3 sec) then it will turn off.

Nov 07, 2009 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

2003 Elantra does not start. New battery.


Sounds like you have a bad or burned contact in the ignition switch.

May 12, 2009 | Hyundai Motor 2003 Elantra

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