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2003 Dodge Ram 4.7l got fuel and spark but no start.

Tiny
DEALER41
  • MEMBER
  • 2003 DODGE RAM
Dodge ram 4.7l My friend thought cat. Converter was plugged so he punched a hole in it. I removed it to inspect it its in great shape.I checked spark plugs most where fouled so I R&R them. Before I did it ran like it was only firing on 4 cyl.S now it won't start at all I gapped the plugs to spec. And checked fuel pressure 47- 57psi while cranking. I checked for spark to each plug that was good. Im trying to read the ecm for codes but it says there are none. I tried to spray eather in the intake just to see if I could get it to pop or try to start but nothing.
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Friday, May 15th, 2009 AT 4:41 PM

10 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
What year is this?

Fuel and Spark okay-lets check engine compression and valve/ignition timing
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Friday, May 15th, 2009 AT 4:52 PM
Tiny
DEALER41
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  • 6 POSTS
It was a 2003 Dodge Ram 1500 4.7L auto trans 2x4 w/ac and cruise. Can you tell me how to check Vale and ignition timing with out it running? The scanner says 5deg BTDC. Not sure if thats what I go off of or not. And I just pulled the valve cover to check to see if it was a broken or lose timing chain but I dont know what amount of play is ok.
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Friday, May 15th, 2009 AT 10:16 PM
Tiny
RASMATAZ
  • MECHANIC
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The timing should read 0 deg on the scantool and also in RANGE if not loosen the distributor and try to set it-this will indicate the correct distributor location. 0 deg is for the fuel synchronization

Checking valve timing-remove sparkplug no. 1 stick a compresion gauge in it or use your finger to feel for compression while you crank engine over in burst stop when you feel the pressure and manually turn the crankshaft to line the markings on the crank pulley and the timing indicator to TDC/0, now open up the distributor cap the rotor should be pointing at the no.1 cap tower if not the valve timing is off, also both no.1 valves should be closed


https://www.2carpros.com/forum/automotive_pictures/12900_timing01_1.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_timing_26.jpg

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Saturday, May 16th, 2009 AT 12:08 AM
Tiny
DEALER41
  • MEMBER
  • 6 POSTS
This motor has a Direct Spark Ignition system. I looked just to be sure but no distributor. Lol just had to check. I thought may Crank/Cam sensor but thay would not let me have spark, right. I used a test light to test the fuel injector leads and I have pulse. Not really sure of a way to see the spray pattern to check if their clean. I used my bore scope to look in the cylinders to look for damage. None. Oh and no codes but mil light still on and after cranking for 8-10sec. It starts flashing, still no code. Ok I checked the compression on the cylinders they range between 118-135psi. I also found a little antifreeze on the pass. Side front plug? Its at 130 psi. Truned crank to TDS mark and the cams align like the picture. It kinda pops a little if I crank it for 10 sec or so. Hmmmm I running out of ideas. Now can I have spark and fuel if the crank/cam sensor was bad? Wouldn't it throw a code?
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Saturday, May 16th, 2009 AT 3:10 AM
Tiny
RASMATAZ
  • MECHANIC
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Sir-you got spark on all plugs and the correct fuel pressure. You need to verify the valve timing investigate thoroughly. That means you have to break it open to check the valve timing /alignment
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Saturday, May 16th, 2009 AT 4:11 PM
Tiny
DEALER41
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I have the vavle covers off and see the cam alignment points the #1 cyl valves a closed. The first cam lobe faces pass. Side and second lobe faces driverside both just slightly down is there any way to adjust timing on DSI systems?
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Saturday, May 16th, 2009 AT 4:42 PM
Tiny
DEALER41
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  • 6 POSTS
Oh timing still says 5deg
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Saturday, May 16th, 2009 AT 4:56 PM
Tiny
RASMATAZ
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The ignition timing is controlled by the computer. What I gave you earlier is the initial timing from there the computer computes it-
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Saturday, May 16th, 2009 AT 5:38 PM
Tiny
DEALER41
  • MEMBER
  • 6 POSTS
Ok so the timing is controlled by the computer. The crank, cam grears and vavles are all in the right place. What am I missing? If the timming should say 0deg and mine says 5deg what could cause that and is there anything else I should try? Chain tension? Resetting ecu. Pushing it to the street and burning it lol
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Saturday, May 16th, 2009 AT 6:11 PM
Tiny
RASMATAZ
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Sir-I'm using Mit1 On demand5 and it does not give the ignition timing specs-to set it you must use the DRB scantool-If you are adjusting ignition timing it has to be 0deg and in range in the scantool to snchronize both the timing and fuel specification

You don't wanna burn it bring in to the dealer this is as far as I can take you -I'm sorry!
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Sunday, May 17th, 2009 AT 6:13 PM

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