Help, #1 son called and said truck not running right, limped it home, engine starts ok, but has big sucking sound and no power wont hold 2000 rpm. engine check light on (son said sometimes blinking on way home) Cant check code - no reader. Pulled the air cleaner - back of air horn has big time vacuum leak thru the top centered behind throttle butterfly's . There is a device bolted to the back of air horn with wires connected: What is it and do u think its causing the vacuum leak?
thanks for any comments
98 1500 4x4 360 quad cab
Didnt know what a IAC was till now - do u think the IAC Idle Air Control could cause the no power issue. If the iac is back mounted on the 98 ram 360 then that might account for the huge sucking sound. Could it have failed open?
The Idle Air Control or MAP could cause a major vaccum leak. Put the Air hat back on the throttle body and take a windex bottle or some sort of spray bottle filled with water....Start spraying around the intake and Throttle body and sensors....You'll hear a change in the engine RPM and you will find your leak.
Autozone will read the codes for free as will Advance Auto Parts.
Or on some trucks you can flip the key on and off pretty fast 3 times and I think it will give give a code. I know mine does it and I think it's 3 times. Then post the code on here and someone can tell you what it is.
Thanks for all the responses, My orginal post was weak on detail, I cant drive the truck to autozone for the free diag, so I got a reader (Harbor freight $99) its says random multiple cylinder miss fires detected. P0303,P0304,p0305 & P0307 thats a lot of stuff not working so I pulled the distributor cap, all the [censored] had crud on them. Feeling stupid for dropping a 100 on OBDII diag for something so obvious, replaced cap and rotor, nothing changed still missing. Did I say that the cap is a bee-och to get to. Reader still says same stuff.
Heres my plan for tomorrow pull the cap make sure igniton wires arent pinched (positive they are ok but will check again) trace all wires to make sure I didnt get them mixed up (do not think I did). Inspect cap and rotor make sure they still look like new.
Then what..... any suggestions? Where is the ignition control module can i test it is it a high dollar item?
I dont want a large Farva. I want a litre of cola!
Joined: Mar 2007
Reputation: 0 Garage: 1
have you pulled a plug yet to see what they look like on the ones that are missing? if you hadnt done maintenance on it often enough to catch the rotor and cap, i would try starting with a regular tune up. Wires, plugs, check all fuses, etc. then you can go from there into things that arent as easy to replace... cat, O2 sensors etc.
i feel for you man, its a long process but just cover your bases and go from there.