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Mike
Mike, Technician
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I have a 1990 dodge ramcharger se150 with 5.9l v8. Recently

Resolved Question:

I have a 1990 dodge ramcharger se150 with 5.9l v8. Recently it has had slight trouble starting but more importantly, at low speeds the transmission slips in and out of different gears with a thud and sometimes the engine stalls. The coil, plugs, fuel pump, have been replaced recently. Trans has full oil level. The engine occasionally surges slightly when idling. I live in UK so expertise is limited to me.
Submitted: 3 years ago.
Category: Car
Expert:  Shantal-Mod replied 3 years ago.
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Expert:  Mike replied 3 years ago.
Hello and Welcome -

My name is XXXXX XXXXX Im happy to help / advise you ..

Can I just ask - what has been done / checked so far - other than what you have mentioned... Have you had any plug in diagnostics done etc ?

Too - what is the mileage?

Also - what was the condition of the trans fluid when you checked that?

Rgds, MIKE........................................
Customer: replied 3 years ago.

Hi Mike,


Thank you for coming back to me. I did check the trans fluid yesterday and it was full, clear, red. I also check the engine oil, clearish and brown - no burning. The fuel pump was changed 18 months ago with a new one. The mileage is 154000. At the same time the fuel pump was changed, it had a new coil and spark plug wires, new plugs, air filter, and wiper motor.


 


I do not have a plug in diagnostic as I am in the United KIngdom. There are Jeep and Dodge dealers around for the UK sales but I don't know if they can help on a vehicle this old. Advice? I do use the on board computer system and I have a 1989 full service manual. The latest codes are:


 


42 SMEC


17 Thermostat which I have a replacement for


37-NA


12


There is an ABS light on in the truck and Maint Req light. Looking in the manual, the Maint Req could be triggered by the EGR having problems.


 


Yesterday, I noticed a slight leak around the battery which I will change this weekend. It has a new muffler, cat convertor, the air line from the pump is properly connected. Everything works


 


It has been running brilliantly until a few days ago and it seems to struggle to keep running. It idles with an occasional surge (five to ten seconds - very slight) and then cuts back. Sometimes, it just stops running.


 


Parts can be bought from the States but there is more than a 100% mark-up on duty and taxes so I have to make it worth my while and be correct when I buy them.


 

Expert:  Mike replied 3 years ago.
Hello again -

Thank you for your reply and further info -

Ok - as far as the idle issues go - I assume you have checked the pipework - breather system/ vacuum lines etc - and for any air ingress / leaks - any of the above not in proper order will cause that at low revs... If you haven't checked - that all needs doing.

Other than that - the biggest issue by far that will cause your idling issues is that the throttle body needs a thorough clean internally - this is best done with a "carb cleaner" spray or such like - ensuring it sprays through all the ports etc - and be sure to clean the edges of the plate / throttle plate - open it to clean that - and also where the plate sits when closed - They get a dirt build up - or stick on the spindle and will cause such issues as you have..

Other than that - you do have the fault code 42 Smec - Injector and module faults etc.. So long as that is not an old / historic code - it could well be relevant... Im going to give you a link to a wealth of info on that ...more than I can type !... so this will be helpful for you on this fault code ( and others )... for that - click HERE. Scroll down to the post 85 model / paragraph.. To - there is a lot more info there for you as I mention - as well as parts supplier too ;)

Code 37 that you have may or may not be important-- it is related to the transmission ( torque converter I will mention in a moment- so you need to follow through on that as follows..
Code 12 you can ignore.

Back to the trans then -

As far as the transmission issues go though which seems to be the main issue ( and can even affect idling too --- as a knock on effect )... This really could at this stage be anything in the transmission / system. I doubt to be honest that its anything on the control side - but of course the wiring / connections etc on the circuit should be checked - but its most likely internal.. either a torque converter or solenoid fault.

You have checked the fluid and thats good - no signs of major issues - so its as above. And then - to be 100% honest - at this point you really are best having an Auto specialist take a look. Usually they will start by opening it up - just removing the pan - and inspecting to any debris - metal filings and such like. They will clean the internal filter and flush it - and re try it. .. then go from there as / if necessary... it could be that will cure it !... but if not - they are fully equipped - both with the knowledge that is needed - and the test equipment and toolery to effect a repair as needed - at much cheaper costs than a general garage would charge. Often dealers and garages send such troubles to these people - as the alternative is replacement - which is always a horrendous cost - compared to repairs as needed....

So thats what I would recommend on this one now -to work through to getting this sorted for you -- thats the best overall / cheapest , cost effective way forward for you.

Check the things I have mentioned on the engine - and the throttle body first...

Let me know how you get on - and Im always happy to help you further as / if needed..

Very best Rgds, MIKE.

Let me know if you need anything more on this at all -

>>> >> > Meantime...

Please do click on the OK rating to Excellent ratings service for me now at this point , Thank you for that... and you can get back to me anytime if you need / wish..

Best Rgds, MIKE.


Mike, Technician
Category: Car
Satisfied Customers: 39198
Experience: Tech Expert
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Customer: replied 3 years ago.

Thank you for the information and the excellent response. I am not at the house for a few days but on my return Saturday, I will check the things you mentioned and see if there is an improvement. I would like to stay in touch with you so there is a consistency in the progress. let me know if that is god for you.


Tony

Expert:  Mike replied 3 years ago.
Hello again Tony -

Thank you for your reply... Im very pleased to have helped you ..

Thats fine yes - Im always here if you need anything.

Best Rgds, MIKE.