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  #1  
Old 05-09-2013, 06:55 PM
ez1990 ez1990 is offline
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Default sudden loss of horse power

I bought a 89' ram150 about 4 months ago. its equipped with a 318 TBI, and I am not unfamiliar with this engine because I've owned five before this one but none of them have given me the problems I am having now

Symptoms:
loss of power
excessive fuel consumption
anything more than half throttle and it misses, sputters, RPM jumps constantly, and anything more than 30MPH is impossible as for any kind of uphill grade
stalls when you stop or slow down

I've tried a new throttle positioning sensor (its currently new) and ive tried a alternate map sensor from my scrap pile but I don't know if its good or not.

and just to complicate the problem it only does this every now and then and does this without warning and whether its hot or cold does not matter
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Old 05-09-2013, 09:53 PM
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CdnoilRAM CdnoilRAM is offline
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Give your catalytic converter a kick; if it rattles then your core has broken loose. I had this happen with my old truck and it was very bizarre because I could never figure out why it was happening and it was intermittent. For me the broken core would get sucked back against the outflow pipe and act like a potato in the exhaust, choking it almost completely off.
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Old 05-10-2013, 01:50 PM
ez1990 ez1990 is offline
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Join Date: May 2013
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Age: 24
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Engine: 1988-1991 318ci (5.2L) LA V8 140hp
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thanks for the advice, I even walked outside at 1:30 last night just to check that but it seems to be a new converter and doesn't make any kind of noise so I don't think that the converter is my problem thanks anyway
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Old 05-10-2013, 10:30 PM
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CdnoilRAM CdnoilRAM is offline
I push the skinny pedal


 
Join Date: Jul 2009
Location: Calgary, AB, CA
Age: 31
Posts: 17,300
Gender: Male
Vehicle: 2009 Blown 349 Hemi
Trim Level: Sport - Modified
Color: Brilliant Black/Snake Skin Green
Engine: 2009-2012 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 20
Rep:3277
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Another thing is the magnum engines are very prone to plenum gasket failures. Another place to try.
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  #5  
Old 05-10-2013, 11:04 PM
ez1990 ez1990 is offline
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Default

its not a magnum its a LA 318 TBI ...but still what is plenum? just from reading part descriptions and symptoms I've came to suspect that it could be either the map sensor or a vehicle speed sensor more the speed sensor since the description of part failure more accurately describes my trucks symptoms
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