4.7 Only revs to 3500 p0315, p0335, p0300

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JordiUK

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Hi folks,

I have searched and googled but can’t find anything similar so apologies if i am repeating another thread.

Just bought my first Ram, a 4.7 on a 2003 plate. It was struggling to start, turned over quite a few times then fired. Ticks over sweet, drives sweet. As long as you don’t go over 3500rpm. Then it just hits a limiter.

Was throwing up codes p0315, p0300 and p0335 which I believe are crank sensor related and miss fire related.

I’ve just done the oil, filter, plugs and coil packs and a crank sensor.

It now starts pretty much instantly but won’t rev past 3500rpm and has decided it no longer wants to idle for long and just cuts out when cold. Seems fine once warmed up.

Any thoughts? My parts guy here in the UK reckoned it could also be cam sensor related, so thats on order or a wiring gremlin???

Cheers
Jordi
 

WY-Dave

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P0300 Random/Multiple Cylinder Misfire Detected
P0315 Crankshaft Position System Variation Not Learned
P0335 Crankshaft Position Sensor A Circuit Malfunction

https://www.obd-codes.com/p03-codes, go here to read on each of the codes
 
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JordiUK

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Cheers for that link, working through the possible causes.

I have an OBD scanner coming so i can clear off the faults and see what comes back on.

The odd one is the limited revs.

Do the cam sensor this weekend and check the wiring on the crank sensor is the next step.
 
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JordiUK

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Had a bit more google and as mentioned this truck is new to me. Had it a shade over a week, work away Mon to Fri, and very limited history of it’s maintenance.

Working through the fault codes and general maintenance.

It’s fitted with the K&N induction kit but god knows when it was last cleaned.

Apparently a severely clogged / dirty filter can cause some major running issues under load. Nothing i’ve ever had experience with as one of my cars is dealer maintained and the other I religiously maintain (1988 Suzuki Samurai, a whole other story ).

Whilst it doesn’t look too horrific I am wondering if its strangling it at higher RPMs, could certainly contribute to the random misfire.

So K&N cleaning kit ordered.
 

LoneWolf3574

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When you say it won't rev past 3500, are you revving the engine while parked (in Park), or are you accelerating like you would on a freeway/highway on-ramp? If you're in park, there is a limiter to prevent damage to your engine and I don't remember what it is on my truck, but I can say it is there.
 
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JordiUK

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Both.

Noticed it whilst driving. Pulls fine up to 3500rpm changes gear nicely, try to accelerate hard and it just bounces at 3500 and doesn’t change up till you ease off.

Wasn’t aware of the limit when parked but its doing it whilst driving too but now every time i change / adjust something i’ll take it for a drive to check and not just rev whilst parked up.

I did read on another forum a chap with a 4.7 Durango had a very similar problem and it was crank sensor and associated wiring issue.
 

Daw14

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Catylitic converter sounds cloogged
 

LoneWolf3574

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If your codes won't clear, I would start with replacing the crank sensor (if you haven't already) and follow that up with an inspection of the wiring. Rubs (ie grounds), breaks, and loose pins in connectors can cause all sorts of havoc on an otherwise working engine.

EDIT - I guess it would help to read the last line of your reply to my question, LOL.
 
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JordiUK

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I’ve done the crank sensor. Cam sensor is being done this weekend.

I haven’t cleared the codes yet, just had a code reader delivered and will read them, make notes then clear and run it and see what comes back on.

Just baffles me how sweet it runs and drives till you push it hard.

Taking it to a mates workshop with lots of gucci equipment this weekend to run some checks.

I’ve downloaded the workshop manual and if the cam sensor doesn’t resolve the issue we plan on doing all the wiring checks.

Lots of little things to work through. Really appreciate all the help and info i’ve got off the forum.

Needless to say i do love the truck. Can’t wait to get it all sorted. Got plans to use it for towing the Samurai around eventually.

I’ll do this weekends jobs and report back.
 
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JordiUK

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The Samurai in question. Not the right place I know but hope everyone appreciates it.

1.6 on an SU carb
4.1 t/box
4.3 diffs
Rear locker
YJ springs
33/12.50s
Custom built full float back axle
Custom fuel tank
Custom exhaust
Various bits of armour

92CBA873-3FEC-4EB3-83C1-7961471DD389.jpeg579B78EE-9D60-4DCE-A78B-17F5145CD49E.jpeg1AB85563-A8B7-425E-A087-5238A948221A.jpeg
 

LoneWolf3574

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I'm glad we can be of some help. Nice toy btw. It's been a long time since I was in the UK, my father was stationed at RAF Bentwaters and we lived in Ipswich and on RAF Woodbridge 1986-1989.
 
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JordiUK

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Aargh!!!

New crank sensor. New cam sensor.

Still getting the faults. Cleared them, tested it. Still getting the faults, still not revving past 3500rpm

On the diagnostics when it hits 3500rpm, essentially it says the cam and crank aren’t synced.

Is it possible that the timing is slightly out? Stretched / slack chain?

Also had a p0339 come up which is also crank sensor related.

Are there any tests you chaps run to see if you are getting the right voltage and signal to the crank sensor plug?

Wiring all looks ok.
 

LoneWolf3574

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It is possible your timing set is worn enough that the guides just reduce the chain slap now or you have somehow jumped a tooth. IF you replace the timing set, I personally would consider replacing the oil pump as well as you have to remove it to change the timing chain. If I'm wrong on this, please correct me, but I would still consider it.
 
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JordiUK

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Thats something I’ve considered. Is the chain tension ok at lower revs but as it climbs higher is the slack too much to keep it all in sync?

I’ve known engines run 180° out so anything is possible.

Few more wiring checks to do as I think there may still be issues there. Always the same fault codes.

Got continuity, voltage, earth checks etc planned for this weekend.

Odd thing is the MIL light is on, my Amazon special £25 OBII reader and my mates snap on machine say it’s off .
 

Sherman Bird

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Hi folks,

I have searched and googled but can’t find anything similar so apologies if i am repeating another thread.

Just bought my first Ram, a 4.7 on a 2003 plate. It was struggling to start, turned over quite a few times then fired. Ticks over sweet, drives sweet. As long as you don’t go over 3500rpm. Then it just hits a limiter.

Was throwing up codes p0315, p0300 and p0335 which I believe are crank sensor related and miss fire related.

I’ve just done the oil, filter, plugs and coil packs and a crank sensor.

It now starts pretty much instantly but won’t rev past 3500rpm and has decided it no longer wants to idle for long and just cuts out when cold. Seems fine once warmed up.

Any thoughts? My parts guy here in the UK reckoned it could also be cam sensor related, so thats on order or a wiring gremlin???

Cheers
Jordi
Cam sensor is a high failure item. Located on the right hand cylinder head underneath at the front. Caveat: It in on the bottom of the front "valley area where oil runs off into the area behind the timing cover, so you'll get an oil bath when you remove the sensor, so be prepared with paper towels. Timing chain (there are 3 chains) guides are mere plastic, and can and do break. This can cause timimg chain to jump a tooth.... so there's that.
 
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JordiUK

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Further into the rabbit hole we go.

The timing is being done as we speak, although we have a suspicion the engine is not the original.

Crank reluctor has been confirmed as 32 tooth, 4 plug pcm.

Passenger side chain tensioner was fully out and the chain still seemed a bit slack.

Fingers crossed this resolves my issue.
 

Sherman Bird

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Further into the rabbit hole we go.

The timing is being done as we speak, although we have a suspicion the engine is not the original.

Crank reluctor has been confirmed as 32 tooth, 4 plug pcm.

Passenger side chain tensioner was fully out and the chain still seemed a bit slack.

Fingers crossed this resolves my issue.
It will fix it! The CMP sensor (Cam) is under the passenger side head at the timing gear reluctor. The other issue MIGHT be the valve seat drop issue.
 

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