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1989 dodge ram d100 318 fuel injectioin engine wont run right
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leeroy1972
New User
Jun 5, 2011, 11:23 PM
Post #1 of 7
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1989 dodge ram d100 318 fuel injectioin engine wont run right
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My truck was running good one day it started running rough and it started losing power it idles good when in park it is hard to start at first and its cold collered and it never was like that. I put new plugs and wires on it and fuel regulator and fuel pump and filter and also a map sensor, cleaned injectors, coolant sensor, timing redone and also throttle control swtch. Wat else could i check so it wont run so rough and feel like it has no power, but when u get it over 10 mph it drives good but once u get to redlight it wantss to die and wont take off right ans sometimes it will die. Does anybody know anything that could help me out.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 6, 2011, 3:02 AM
Post #2 of 7
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Re: 1989 dodge ram d100 318 fuel injectioin engine wont run right
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Some ideas to check at the age: Vacuum leaks, PCV system - sludge situation if any. ? How much was the timing off? It doesn't really change on it's own unless touched. Clean throttle body. One more for now is check lash in timing chain. TMK if OE it would still be a nylon cam gear and they don't hold up well with time, never mind miles. It's an interference engine (pretty sure) meaning valves can crash into pistons if it goes - worth paying attention to those even though they can last a long time, T
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leeroy1972
New User
Jun 6, 2011, 7:49 AM
Post #3 of 7
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Re: 1989 dodge ram d100 318 fuel injectioin engine wont run right
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how do i check timing chain and what is tmk or oe mean....
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leeroy1972
New User
Jun 6, 2011, 7:51 AM
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Re: 1989 dodge ram d100 318 fuel injectioin engine wont run right
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is there any we you can call me at 931 638 9138 i live in tennessee...
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 6, 2011, 8:30 AM
Post #5 of 7
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Re: 1989 dodge ram d100 318 fuel injectioin engine wont run right
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Rather leave things on the web. Two easy ways without tearing the thing apart to get a good clue on timing chains is 1. Take an actual manifold vacuum reading and should be near 18Hg on a "T" connector so item still gets vacuum. Another is to set timing mark at TDC, removed distributor cap and see how many degrees it turns before rotor inside distributor turns. Turn by crank bolt back and forth. IMO 5 degrees is enough of free-play. Short of seeing it with a scope and not sure you can you'd have to be looking at it. Not sure there's an easy inspection item to see it. I drive older stuff and know what can happen with age and miles even on good American Iron the OE (original equipment) parts used a lot of plastic cam gears. Replacements would be all metal and last quite well. At the age it could be a lot of diagnosing and perhaps some guessing if not owned since new ( or excellent history) it's one place where to start looking, T
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leeroy1972
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Jun 7, 2011, 9:30 AM
Post #6 of 7
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Re: 1989 dodge ram d100 318 fuel injectioin engine wont run right
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what about oxygen sensor would this cause the excelarator to bogg down..
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 7, 2011, 10:45 AM
Post #7 of 7
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Re: 1989 dodge ram d100 318 fuel injectioin engine wont run right
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1989 and a truck? I don't think most or any O2 sensors would cause rough running alone as they can on newer stuff. It may be bad but IMO for the year more to tell you something isn't quite right to tend to and the ones I've personally dealt with the result of another problem rather than the source. If misfiring or raw fuel overloads a converter they can and will clog up and the common feel of that was (to me) low even power as like an exhaust restriction which it would become. Would usually work OK cold for a while then lose power but smoothly up to quitting. You can do a simple test for exhaust restriction if you want to rule that out by just watching actual manifold vacuum at idle and with no load again at 2,000 RPMs and they should be dang near the same. If much lower at the raised idle it strongly suggests exhaust restriction. Other on this Mopar. It may use a thermostatic "thingy" (nice definition Tom) on one exhaust manifold to shoot warm air under to help atomize fuel while cold then give up as engine warmed up. That was more on older stuff than this but trucks may have hung on to that a bit longer?? I plead IDK as for a while back when trucks were given longer to meet standards than passenger cars for a while and by the 90s had to meet all for sale to the US anyway. Guessing as it's old and a truck but if it has one of those stuck (should be free in hand - cold check please) and stayed on they could clog the heck out of things with sludge unseen. Doubt you have that AND fuel injection. What else have you found checking? Plain guessing isn't the best approach even that long ago, T
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