just got my custom tune
03-15-2015, 05:34 PM
#1
Senior Member
Thread Starter
just got my custom tune
Just got my custom tune in from PHP and I am excited bit nervous. My truck has developed a rough idle it's not a violent shake but enough to be annoying she Idles around 650 occasionally going down to 630ish. I have the 4.6 with a CAI. It didn't do this until I went from running my canned tune to running stock again after I cleaned my MAF sensor and throttle body. Any thoughts? Should I go get it looked at before I put the tune in?
03-16-2015, 12:11 AM
#2
Mine did this ended up being tps. Only reason mine had such a rough idle cause it was runing to low of rpms. Do u notice if it idles real high wen u first start it for acouple seconds right before it idles down? Mine would also be fine as soon as I put it in drive
03-16-2015, 10:48 AM
#3
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Thread Starter
It does idle high when I first start it but if I put it in gear they come down to about 750 once it reaches normal temp of 186 or so is when it starts idling rough. RPM will start jumping from 650-620 I had it go as low as 540 once. If I hit the gas it goes away.
03-16-2015, 12:33 PM
#5
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03-16-2015, 02:59 PM
#7
Senior Member
Thread Starter
Did yours do it when in gear at red lights also? And started getting bad gas mileage? I bought a new FPDM yesterday as mine is looking a little corroded
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03-16-2015, 09:23 PM
#8
Ya it do it in gear also . I just changed my fuel pump drive modules also Ino it will make ur truck run like **** . Wen it completely goes bad ur truck won't even stArt . So that was a good idea to change now they put it in a terrible spot mine was cracked opened and was pack with mud lol
03-16-2015, 09:51 PM
#9
Senior Member
Ya it do it in gear also . I just changed my fuel pump drive modules also Ino it will make ur truck run like **** . Wen it completely goes bad ur truck won't even stArt . So that was a good idea to change now they put it in a terrible spot mine was cracked opened and was pack with mud lol
03-16-2015, 11:58 PM
#10
Fuel pump drive module never herd of this part?? , it's by the spare tire on a cross member if it seems like ur trucks not geting fuel and the fuel pump is still runing good chance it could be that. When they go completely bad ur truck won't even start . My truck wouldn't start one day was thinking it could be the fuel pump . So I went on the autozone app looking for one and came across the fpdm . Googled it to find were it was located wen I found it it was in pieces and full of mud . Got a new one and it fired right up nice cheap and easy fix glad it wasnt the fuel pump