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Author Topic: Dodge Ram W-100 1988 TBI 318  (Read 2901 times)

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Offline azicafoose

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Dodge Ram W-100 1988 TBI 318
« on: February 16, 2011, 10:41:27 AM »
So, I have looked on this site for symptoms similar to what  I have and have found a few, but after a while there are no answers. I am posting this as a need help that may turn into a tech for diagnosis of this very common problem.

Symptom: 65000 miles original.
The truck does not like to idle with a thermostat in. It will bog itself down and eventually cut out loping high idle, extremely low idle (low enough for oil pressure light to kick on occasionally. After about 10 cycles it dies out, what I am assuming is the Idle control motor clicks 3 times and then all you hear is the radio and the heater lol. It used to do this only 2 or 3 times before staying lit and would blow white smoke and just smell toooooooo rich in the exhaust. I took the thermostat out for a while and no problems anymore. I had to put it back in when my pregnant wife, gonna have another boy, blew her Grand Cherokee's #6 piston into fragmnets. So we got a car for her to drive as prego and lifted truck don't go well together, and I let it sit as it is my clunker for junkyard, sanitation yard, back yard, and long yard truck. Started it up to go to Sears and get my wife her new fridge and on the way it was acting like it had bad gas. So went to the gas station, got a half tank ran some HEET through it and we took off. Not long after I left out of gas station it started doing the same thing

As you would press the gas down it would lunge and then act like it wasn't getting enough gas even at WOT.

It would stall on deceleration, and it would not stay started unless throttle was feathered and slammed into drive.

I thought Eh sounds like the TPS has a flat spot and since I was getting error 13 I thought what the heck Ill buy the map sensor as well. Got home checked the hose no leaks to MAP, none others really checked will check tonight for the other vaccume leaks in hoses right now, more on that later. So i replace the sensors,white smoke and smell go away, WOOHOO, and so I decide to drive it around the block. No problems, till I have to stop by the high school and it starts loping again and tries to stall out. I heavily feather the gas to get the truck limped back to the house and park again. Last night I go to Dairy Queen and take the truck after a couple days of being unplugged from the battery to reset the PCM. Runs great until I have to get into traffic. Needless to say same problem however, it has no hesitation at WOT.

Done so far:
Cleaned the injectors
Poured HEET and cleaner through the gas line
Changed TPS and MAP sensors, checked map hose
Ran carb/TBI cleaner through the intake multiple times
New cap, plugs, wires, not rotor though will change it once the old one will come off.


TO DO:
EGR valve check or removal.(Reccomendations as far as power vs Mpg goes)
Check more vaccume lines
Idle control motor check
Check booster brake line.
Any thing else you guys can think of.
Check gas line pressure

Thanks for reading

Andrew

Offline ToxicDoc

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Re: Dodge Ram W-100 1988 TBI 318
« Reply #1 on: February 16, 2011, 10:52:16 AM »
Recheck codes, check fuel pressure.
'85 W150 SB, 408 stroker, Magnum manifolds, Performer RPM, 670 Truck Avenger, HEI ignition, Auburn LSD 9.25 and '82 D44 (non-CAD) with 3.55/3.54,  NV4500/NP241

Offline stumpy383

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Re: Dodge Ram W-100 1988 TBI 318
« Reply #2 on: February 16, 2011, 01:01:55 PM »
Sounds almost like a blown head gasket.
Been building high performance Mopars since 1965

Offline v737d

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Re: Dodge Ram W-100 1988 TBI 318
« Reply #3 on: February 16, 2011, 01:15:48 PM »
So white smoke out the exhaust and it smells like gas?  The smoke is not steam?

If she wont run with the thermostat in, then I am suspecting you have a faulty CTS sensor.  (coolant temp sensor)  It tells the computer when the engine is warm and to come out of its warm up mode (like having a choke on with a carb).  I am thinking the sensor has gone south and the computer is in perpetual warm up mode.  Excess gas out the pipe, bad running and stumbling as the mixture in the cylinders is too rich.

But before you do anything, check your codes.

You may have used fuel cleaner in the tank but that doesn't mean your injectors are clean.  You have to take  the air cleaner off, climb up so you can look straight down the TBI. Then make sure it is very very dark and use a flashlight or timing light to check your injector spray pattern.

Cheers

Chris
87 RC, 318, auto, 2WD, dual exh, hooker header, full elec FBO ignition, 31's on '03 Ram 17" rims, Borgeson steering

88 RC 318 auto, 2wd stock except for 31 BFG AT on 17"s

'76 RC 440 727 NP203 33"

The oxen are slow but the Earth is patient.

Offline DODGEBOYS

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Re: Dodge Ram W-100 1988 TBI 318
« Reply #4 on: February 16, 2011, 03:33:48 PM »
l,d say pull apart and check - clean the connectors at the back of the right valve cover and at the PCM / use lots of dielectric grease
put your truck info HERE
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Offline azicafoose

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Re: Dodge Ram W-100 1988 TBI 318
« Reply #5 on: February 16, 2011, 06:57:51 PM »
Update Numero uno:

1.) Pulled the wires on the coolant temperature sensor (CTS) and would not stay lit. Would limp to life and shut off. Plugged it back up would stay on, so if there is a problem with the CTS it is in a faulte send, because as I understand it, When there is no or very little signal from the sensor it tells the pcm that the engine is overheating Correct. The engine would shut off if i pulled the plug while running as well.

2.) Unplugged the idle control motor (ICM) and not a difference in idle, it simply did the same as before for idle. No clicks after the engine died though. I moved the recall position spring, the spring that pulls the throttle linkage so that the gas pedal will resume closed position, just to make sure thtat the ICM didn't have too much force working against it. I have had it over drawn as the gas pedal would lay on the floor with it in the stock position.

3.) Just so you know I live in WV no emission tests, the smog pump had been removed when i bought the truck, shouldn't mean much of anything just thought I would add that.
New error codes are as follows, 12 22 33 36 and 52 (This one is self induced as I was trying to get the light to come on)

12 is battery disconnect
22 is ICM error

33 is lockup solenoid
36 is temperature signal
52 is o2 sensor

An update on the white smoke is that it no longer does that as I replaced the map sensor and TPS sensor. Smell of gas has significantly decreased since they have been chaged as well. Will check the fuel pressure once i get the tools i need to check it.
« Last Edit: February 16, 2011, 07:02:44 PM by azicafoose »

Offline v737d

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Re: Dodge Ram W-100 1988 TBI 318
« Reply #6 on: February 16, 2011, 09:03:22 PM »
Your engine should stay running with the CTS unplugged, it is the FSM way to set initial timing.

Start engine, wait until it is warmed up, unplug CTS, set timing at 10 BTDC and replug the CTS. 

i have personally done this procedure on my '88 after replacing the Hall effect.  No running problems with it unplugged whatsoever. 

Perhaps your base timing is off.

So no smog pump, are the lines plugged at the air inlet for the CAT? How about the hole in the exhaust manifolds where the air line hooked up?

Does it still have an O2 sensor? I'm guessing it does as your not throwing a code for it but I thought I would ask.

Cheers

Chris
87 RC, 318, auto, 2WD, dual exh, hooker header, full elec FBO ignition, 31's on '03 Ram 17" rims, Borgeson steering

88 RC 318 auto, 2wd stock except for 31 BFG AT on 17"s

'76 RC 440 727 NP203 33"

The oxen are slow but the Earth is patient.

Offline azicafoose

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Re: Dodge Ram W-100 1988 TBI 318
« Reply #7 on: February 17, 2011, 11:29:24 AM »
All lines of smog pump are bocked guy used lug nuts lol. The o2 sensor was unplugged as i was trying to get the check engine light to come on for testing purposes i plugged it back up.

Well if its not supposed to shut off then why is it, can't get the daggone thing to stay running to get it warm.

It doesn't act like timing is off even a little, will check it though. With a light.

Offline DODGEBOYS

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Re: Dodge Ram W-100 1988 TBI 318
« Reply #8 on: February 17, 2011, 11:39:09 AM »
the temp sensor on an EFI system acts as the CHOKE
put your truck info HERE
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Offline v737d

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Re: Dodge Ram W-100 1988 TBI 318
« Reply #9 on: February 17, 2011, 01:26:04 PM »
OK, you have to get the engine to operating temp THEN unplug the CTS and set your base timing.  IF it doesn't run after being at temp with the CTS unplugged then your base timing is off, probably way off.

Do the procedure, re time it and let us know

Cheers

Chris
87 RC, 318, auto, 2WD, dual exh, hooker header, full elec FBO ignition, 31's on '03 Ram 17" rims, Borgeson steering

88 RC 318 auto, 2wd stock except for 31 BFG AT on 17"s

'76 RC 440 727 NP203 33"

The oxen are slow but the Earth is patient.

Offline DerangedMoose

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Re: Dodge Ram W-100 1988 TBI 318
« Reply #10 on: June 30, 2014, 11:47:09 PM »
 I know this is an old post  what was the out come?  and after all the work to the cooling system did he bleed the system ?