Question about 2003 Chevrolet Silverado 1500

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2003 Chevrolet Silverado 4.3 V6 with MFI. Engine ran not start.

2003 Chevrolet Silverado 4.3 V6 with MFI. Engine ran perfectly until about 35,000 miles. Four days ago it would not start. Engine cranks fine, spark plugs fire okay, and fuel pump works. The engine has only started one time (with numerous tries) since this problem appeared four days ago. Vehicle has not been taken on the road since the problem first occured. It will not start today. Any suggestions would be appreciated. Thank you.

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  • 293 Answers

Well it could be numerous if things but you want suggestions...So here's mine..Your gas tank might be vapor locked...This is caused from over filling your gas tank with gas over the years..Its when the pressure in your gas tank becomes greater than your fuel pump. It wont start until the pressure in your gas tank becomes lower then you fuel pump...Sounds crazy...This got me once...I didn't understand it...A lot of people (including me) Go to the gas station and get that extra 50 cent after the gas nozzle clicks off...over time that extra gas will run down the vapor lines intended to burn fumes....Like when you fill a gas can to cut your grass...If you sake the gas can it builds pressure and bows up. But with time that pressure will go away...Well saying that...Your gas tank needs to vent to....So your car burns not only gas but fumes...If you keep over filling your car with the extra gas it cloggs up your vapor canister intended for fumes or vapors...The gas will will go into that canister and clogg up the charcoal that's inside it. (Breaks it down) then the vapors can't get to your carburetor where it supposed to burns it. So what happens is the pressure in the gas tank becomes greater than your fuel pump and then car won't start..Are you with me? Lol Its crazy..Putting a different gas cap can cause the same thing...Simple test...When you open your gas cap to get gas.. Do you heat air sucking in.. Yes you can hear it....A lot of times loosening the cap let's the pressure out and the car will start right up.....Thus might not be your problem but worth telling at the gas pumps to other people..... Just trying to help

Posted on Jul 01, 2017

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 1997 chevy silverado 3500 with

We found the problem by taking the truck to the dealership, after spending $550.00 on parts and having everything we could remove tested or we purchased them new and replaced them. We spent two weeks on it and took it to Chevrolet but it took them three days after all we had done, the problem turned out to be the gear on the distributor, sure we replaced every part in it but because we could not get the distributor out with the intake on it we had not even considered the gear, thanks for your assistance and maybe we'll try you again next time....Thanks again.

Posted on Jan 17, 2009

  • 79 Answers

SOURCE: faulty gas gauge

Have a 2001 chev and it does the same thing. It is a common problem. It is a faulty in tank sender, not the fuel pump. You can just replace the sending unit by removing tank. If you want more information please get back to me.

Posted on Apr 27, 2009

Molson02536
  • 3854 Answers

SOURCE: 1992 Suburban 1500 with 5.7. Cranks but no spark.

Did you try to get any DTC codes from the ECM. If not here is the procedure to retrieving the DTC codes. http://www.troublecodes.net/GM/ Check the fuses, make sure there all good. hope you find a DTC code which would help us find out what is wrong with the suburban quicker. Keep me posted and good luck, be glad to help you.

Posted on Jun 04, 2009

  • 10 Answers

SOURCE: 1998 chevy c15 5.7 SFI SYSTEM

My truck did this after I replaced the fuel pump. Turned out to Fuel Pressure Regulator. It would crank and crank but never start. It's located underneath the black plastic manifold on the side of the injectors.

Posted on Feb 19, 2010

  • 834 Answers

SOURCE: 1999 silverado 4.3 cranks but

First check to see if full battery voltage is even getting to the "Pos" (+) positive side of the ignition coil when the key is in the "Run" position, and also that full battery voltage is getting through the "Pos" (+) or positive side of the ignition coil and over to the distributor ignition module

The ignition module and the pick-up coil/stator located inside of the distributor is what generates the signal that the ECM (Engine Control Module) uses to time and fire the fuel injectors, as well as the signal to run the fuel pump and the dwell signal timing to fire the ignition coil, and a faulty ignition module can cause any one of these systems to malfunction.

That does sound like a malfunction with the ignition module inside of the distributor, and you can remove the ignition module and have it tested for free at most auto part stores. If the ignition module does test out alright then the problem could still be in the pick-up coil/stator, (it can be tested using an ohm meter by dis-connecting the wire connector from the pick-up coil/stator and the ohm reading between the two wires from the pick-up coil/stator should be between 500 and 1500 ohm's, and both of the wires from the pick-up coil/stator should show an open loop or an infinite reading between each wire and ground) and if the pick-up coil/stator is found to be faulty then replace the entire distributor, or the distributor will have to be dis-assembled to install a new pick-up coil/stator.

If you do purchase a new ignition module be sure that it does come with a silicone grease or a die-electric compound because it is a heat sink and the ignition module will burn up without it.

To install the new ignition module first clean out the mounting surface inside of the distributor. Then completely coat the metal contact surface under the ignition module with a thick coat the silicone grease or die-electric compound and do not leave any of the metal contact surface of the ignition module un-coated with the silicone grease or die-electric compound, and be very careful not to over-tighten the ignition module or it will be damaged.

To replace the distributor follow this procedure;

The ignition timing is not adjusted with a timing light or with the engine running, and to set the ignition timing follow these procedures.

There is a mark or notch on the distributor housing that the rotor should be pointing to when the engine is on top dead center. This "static" timing is all that matters and the computer will be able to control the timing as long as the ignition rotor is in that position when the engine is at top dead center.

Removal;

1. With the engine at top dead center.

2. Look under the distributor cap and find where the number one terminal runs under the distributor cap, and where that position on the distributor cap corresponds with the distributor housing, and it should match up to a mark or a notch on the distributor housing indicating the number one position.

3. With the engine on top dead center the ignition rotor should be pointing to the number one mark or notch that is on the distributor housing, Then make a reference mark of the position that the ignition rotor is pointing to (out on the engine or firewall) and the more precise you mark the position, the easier the installation of the new distributor will be. This will be reference mark #1.

4. Remove the distributor lock down bolt, (the lock down clamp will most likely be attached to the distributor and if so it should not be removed from the distributor) then slowly lift up on the distributor about three inches and note the direction that the ignition rotor turns, and when the ignition rotor stops turning then mark the position that the ignition rotor is pointing to (out on the engine or firewall) and then lift the distributor striaght up and out, and remove the gasket or any left over gasket material from the intake manifold. The more precise you mark the position the easier it will be to install the new distributor and an assistant might be helpful. This will be reference mark #2

Once the distributor has been removed it is important that the engine does not get cranked over by the starter or the crankshaft turned at all, or the reference marks will become useless.

Installation;

Be sure that the new distributor is complete with a new module and that there is a new gasket in place on the distributor.

1. Lower the distributor with gasket down into the distrbutor well and align the ignition rotor with the #2 reference mark and when the distributor gear engages the drive gear on the camshaft then the ignition rotor should turn to the #1 reference mark as the distributor sets all the way back down flush on the intake manifold.

2. Install and tighten the lock down bolt, and If the distributor is properly installed then the ignition rotor should be pointing to the #1 reference mark and the #1 position on the distributor housing with the engine on top dead center.

Replace the distributor cap and connect the spark plug wires, and see if the engine will start, if the engine does start and the check engine light does not come on (assuming that it was not on before) then the distributor is properly installed and there is no further timing requirements.

Let me know if you require any further assistance.



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Posted on Jul 31, 2010

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Dec 26, 2015 | 2004 Chevrolet Chevrolet Silverado 1500...

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My 2003 chevy truck 1500 with a v6 runs good 15miles and after that it starts missing and like something holding it back


IF the "check engine" or "service engine soon" light is on. You can take it to most any auto parts store to get the codes read.

Better yet would be to find someone with an actual scanning tool to see what all of the sensors are reading.

IF there is no check engine or service engine soon light on then it could be quite a few different things wrong.

A plugged catalytic converter is a possibility. Another item that i ran across on 3 different vehicles within a day was a bad coolant temperature sensor. All 3 vehicles ran fine when 1st started, but then slowly started to "load up" or run rich. REAL rich.

Turned out on all 3 vehicles there was NO check engine/service engine soon light but after hooking up the scanning tool all 3 showed the coolant temp sensor was reading -40°!!

Yup, the computer was being told the engine was at 40 BELOW zero. The computer took that info and adjusted the fuel/air mixture and timing to help the engine warm up.

While the engine warmed up, the sensor kept saying it was 40 below and made the engine run rich.

This MAY be the problem, but without a scan tool it's hard to say.

Hope this helps.

Feb 19, 2015 | 2003 Chevrolet Silverado 1500

1 Answer

2000 silverado 4.3 V6. Replaced feul pump and niw it starts but it takes 3-4 cranks in the morn to start it and then it runs very rough untill it has ran for 1/2 to 1 hr. Also have replace fuel filter...


The rough running should have caused the check engine light to come on. It would be a good idea to goa ahead and scan the engine for trouble codes. The rough running could be a number of things. The codes would help us pinpoint the correct part ot replace, rather than start replacing parts until we get lucky and hit the right one. That could be very expensive.

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1 Answer

How to get out water leakage on top of my 2001 f-150 engine


Please email me the engine size information on reply.
Pick one from below.
V6 - 4.2L vin 2 256ci - MFI GAS OHV V8 - 4.6L vin W 281ci - MFI GAS SOHC V8 - 5.4L vin 3 330ci - MFI GAS SOHC Super-charged V8 - 5.4L vin L 330ci - MFI GAS SOHC V8 - 5.4L vin M 330ci - MFI CNG SOHC V8 - 5.4L vin Z 330ci - MFI BI-FUEL SOHC Harley-Davidson Edition -- V8 - 5.4L vin L 330ci - MFI GAS SOHC Lightning -- V8 - 5.4L vin 3 330ci - MFI GAS SOHC Super-charged
====
Please identify the color of the leakage.
Green? brown/rusty? oily?
Most likely is coolant leak but on high mileage engine it can be oil vapor + morning cold air condensation.
How many miles is on this engine?
How much water leakage is seating on for of the engine?
Is it in on particular spot?
====
I strongly recommend you to open a CHAT SESSION instead of a single page email session.
You will need a lot of back and forth Question and Answer to trouble-shoot this leakage problem.
I will glad to help if you post a CHAT SESSION.

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For the 2003 Chevrolet 4.3L V6:

Firing Order
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1-6-5-4-3-2

Cylinders:
......(back)......
|..6..|.......|..5..|
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Distributor Connections:
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Coil-> o
6-----> o.......o <-----5
4-----> o.......o <-----1
2-----> o.......o <-----3
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Let me now if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

Apr 21, 2010 | 2003 Chevrolet Silverado 1500

1 Answer

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http://www.s10forum.com/forum/f107/scpi-to-mfi-upgrade-kit-324166/
http://members.shaw.ca/betterthanyoutoo/Sticking%20Poppet.htm

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it might be that the gas pump isn't connecting to the engine.

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