Low Idle and RPM Drop - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
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post #1 of 8 Old 03-07-2014, 01:54 PM Thread Starter
rampowerhouse
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Low Idle and RPM Drop

Hey guys needin some help her. I got 95 Ram 1500 5.9 4x4.
It has always idled low, but has gotten worse recently.
It idles in park and neutral at around 500. But when dropped into
gear it will go down to around 200 to 250. Even wierder is when
I pull up on a hill and let off the throttle the RPMs will drop to
almost 0 then jump back up. No problems at normal speeds cruises
and shifts perfect. Already replaced plugs, wires, cap, rotor, IAC,
and TPS. Any suggestions are greatly appreciated.
Thanks guys in advance!
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post #2 of 8 Old 03-08-2014, 09:25 AM
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What condition is the battery in? A weak battery or bad connections can cause idle issues.
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post #3 of 8 Old 03-08-2014, 11:10 AM Thread Starter
rampowerhouse
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Battery tested good and i replaced all the vacuum lines because they were brittle and snapping when i changed the cap and rotor.
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post #4 of 8 Old 03-09-2014, 02:06 PM Thread Starter
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Anybody else got an idea?
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post #5 of 8 Old 03-09-2014, 02:28 PM
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Plugged idle air passages?....Maybe clean throttle body; IDK, but Seafoam spray stuff might be an easy thing to try.
.... "SEEMINGLY" good batteries have plagued others.

99 1500 SLT QCSB 4x4 5.2 227k mi; SUN vac ga, tow hooks ... umpteenth 46re, LONG 28K lb tr cooler, HAYDEN temp ga ... 3.55 c/w broken clip, 255/70 MICH M+S ... RED HEAD, DSS, MOOG trac n adj BJ; AMS in motor n diffs; HUSKY flr mats ... New shocks, drums, EXTREME rotors, bat; rebuilt mas cyl, alt ... Recent windshield, rad, rr springs, frt axle joints n seals ... Hand vac pump to control recirc door

97 1500 SLT CCSB 4x4 5.2 auto 3.55 lsd, factory tr cooler, HD fan clutch; 140k mi
--Both have spray in box liners; need PS coolers, htr cores and better water pumps for htr/winter use
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post #6 of 8 Old 03-09-2014, 10:35 PM
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the egr is supposed to open up in high vac conditions. namely when the truck is at idle. an open egr will also raise the idle? hum. check and diagnose the egr valve!

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post #7 of 8 Old 03-11-2014, 12:10 PM Thread Starter
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Thats sounds more like it. How would i check the egr?
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post #8 of 8 Old 03-11-2014, 09:58 PM
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engine off: find the vac control valve. put a suction pump on it and measure for loose of pressure.
engine on: hook up pump to vac control valve. nipple off the manifold leads. initiate about 18" and listen for the idle to change speed. if the engine doesnt increase rpm, than the egr valve is bad/ leaking or the exhaust recirculator pipe is clogged.
the egr is located to left of the dizzy mounted on the intake manifold .

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