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Author Topic: Can bad timing cause two cylinders to not function? section525 Sponsored by Corona® Member # 2819 posted                                 Here's the deal: My motor runs, but very rough and very hard to start. The two coil packs are sparking all wires. All wires are sparking the plugs. Plugs are good. The fuel injector is getting it's pulse signal. I have yet to actually pull the two injectors and replace them. The problem is that I can remove every wire from the coil packs (individually) and all will change the smoothness of the idle except 1 and 5. So that tells me those cylinders are not doing their part! Can anyone give me an idea on what the problem could be? I plan on taking off the fuel rail and changing those two injectors out... but I don't think they could have just went bad like that. By the way.. this all started after putting in an ecam and roller rockers. Thanks! -------------------- 1996 5.0L K&N Intake, E-303 Cam, 1.6 Roller Rockers, TM Headers, Magnaflow, on 35s! Posts: 207 | From: Chico, CA | Registered: May 2003  |  : Joooestang66 ¯ Member # 2828 posted                              I hope youre talking about a 96' Explorer, because in that year that was the only vehicle equipped with a 5.0. If I were you I'd get it professionally diagnosed. Or atleast hook up a Noid light to each of the injector harness connectors. You probably also wanna check your rocker arm clearances on those cylinders. -------------------- "Don't Drive Faster Than your Guardian Angel Can Fly..... Well My Guardian Angel Can Fly Pretty Fuc*ing Fast!!!" Posts: 581 | From: Elk Grove | Registered: May 2003  |  : white1990stang ¯ Member # 2307 posted                              did you tighten those rockers too tight? thenm you would have none if very little comp. in those cylinders. -------------------- You must be fast, cause I was haullin ass when I passed you. Posts: 1308 | From: martinez | Registered: Jan 2003  |  : Elapid GOROBGO Member # 50 posted                                 are the valves closing on those cylinders? are they opening? check compression on those two... that should give you more clues. -------------------- 98 Cobra 83 Notch rolling chassis - fs Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000  |  : DropTopFox drama Member # 1689 posted                              well unless you have a timing adjuster, timing won't change on your motor. I would pull codes to see what's going on. This doesn't sound like something the average guy would be able to fix -------------------- Go out and do something for yourself today everyone, quit depending on others -Me http://www.CaliforniaFords.com/cgi-bin/album.pl?album=00001689 Posts: 4003 | From: San Bruno | Registered: Aug 2002  |  : Blue Oval ¯ Member # 2548 posted                              Isnt this a 5.0L whats with the no timing adjustement what year of 5.0l engine did u do the swap with?was the cam used or new that u put in?like already aid did u tighten the Rocker arms too tight?did u check the clearances? -------------------- 65 Coupe 306, AFR's 89 Cali. Ed. Saleen "sold" BAB 89 GT 08 Yamaha R6 Posts: 2345 | From: Sacramento | Registered: Mar 2003  |  : section525 Sponsored by Corona® Member # 2819 posted                                 Figured it out! Cylinder #5 had 40 lbs per inch compression while every other cylinder (even #1) had around 150 lbs. So I tore the intake off to get the valve cover off so I could see what was going on. Just for kicks I took the rockers off that cylinder, checked and retorqued them. I built the intake back up with the valve cover off (again). It ran perfect. Back to 150# in cylinder #5. So I tore it down again to the lower intake. As I was putting the valve cover back on I paid close attention the the clearance this time. Basically, this time, the closest rocker to the front was at it's highest point in the stoke.. and made the valve cover hole not line up on that side. So we cranked the motor by hand until the holes lined up.. then holding the cover.. I cranked the motor while my buddy watched/felt the valve cover. Sure enough it hit. So I pulled it back off and it was actually hitting on the wall over the cover and not on the top. I never thought that would have happened. So I double gasketed that side. Still hits. So I guess I'll have to pick up some taller (wider, I guess) covers tomorrow. As anyone heard of this problem? These are GT-40P heads and FMS Roller Rockers. Although the valve covers are stock.. it seems like they should have been wide enough for a different rocker. Should I just get some taller FMS coves? This is a '96 Explorer 5.0. DIS system. Thanks for all the help! I'm glad I was able to kick this things ass myself! -------------------- 1996 5.0L K&N Intake, E-303 Cam, 1.6 Roller Rockers, TM Headers, Magnaflow, on 35s! Posts: 207 | From: Chico, CA | Registered: May 2003  |  : Blue Oval ¯ Member # 2548 posted                              thats what i thought had happen just a little too much tourqe will leave the valve open.glad u found it.if u have a grinder u can take the valve cover off and grind some of the inside of it off where its hitting at. edit:be very care full u dont grind too much as u could go through. [ January 08, 2004, 08:30 PM: Message edited by: Blue Oval ] -------------------- 65 Coupe 306, AFR's 89 Cali. Ed. Saleen "sold" BAB 89 GT 08 Yamaha R6 Posts: 2345 | From: Sacramento | Registered: Mar 2003  |  : section525 Sponsored by Corona® Member # 2819 posted                                 Yeah, I don't have a dremel (yet) and my wheel grinder is too big to get in there. Maybe I'll try that first before I invest in new covers. It just seems like it would be a lot I'd need to grind off in order for it to work. Guess I'll find out tomorrow. -------------------- 1996 5.0L K&N Intake, E-303 Cam, 1.6 Roller Rockers, TM Headers, Magnaflow, on 35s! Posts: 207 | From: Chico, CA | Registered: May 2003  |  : Hungry Hippo ¯ Member # 537 posted                              i would try grinding it first. try a drill with a sanding bit on it. if that doesnt work, get some foxbody 5.0 valve covers -------------------- 05 S4 Avant(wagon) 09 C6 H/C/I Posts: 2959 | From: east bay | Registered: Nov 2001  |  : section525 Sponsored by Corona® Member # 2819 posted                                 DONE! Finished it 100%! That valve cover was no match for my air hammer! It's all back together and road ready. Here's a little vid http://www.section525.com/xpage/ecam3.wmv My Specs: K&N Intake Explorer Upper GT40 Lower GT40-P Heads E-303 Cam 1.6 Roller Rockers FMS Headers Apten Chip Stock Exhaust Again, thanks for all the help guys! [ January 09, 2004, 12:43 AM: Message edited by: section525 ] -------------------- 1996 5.0L K&N Intake, E-303 Cam, 1.6 Roller Rockers, TM Headers, Magnaflow, on 35s! Posts: 207 | From: Chico, CA | Registered: May 2003  |  : Hungry Hippo ¯ Member # 537 posted                              i love sleepers like that! -------------------- 05 S4 Avant(wagon) 09 C6 H/C/I Posts: 2959 | From: east bay | Registered: Nov 2001  |  :

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