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318 engine probs HELP !!!! #1315616 10/05/12 06:19 AM 10/05/12 06:19 AM
Joined: Oct 2012 Posts: 6 S sandman13211 OP member
sandman13211 OP member S Joined: Oct 2012 Posts: 6	Having problems with my 1978 dodge d100 318 engine, suspect a vacum leak on engine some where, carb is fine, ? is could a engine head gasket leak be casuing fuel loss of cylinder pressure on pistons 3,5, and 7 ???? or could it be the intake manifold gasket ???? Been banging head on this one, friend is helping and he is stumped as well, we just have possibilities right now, if any one has advice or answers please comment or send a message, PLEASE HELP !!!!!!!!!!!!

Re: 318 engine probs HELP !!!! [Re: sandman13211] #1315617 10/05/12 07:36 AM 10/05/12 07:36 AM
Joined: Jan 2003 Posts: 2,179 Walton, Indiana TimS top fuel
TimS top fuel Joined: Jan 2003 Posts: 2,179 Walton, Indiana	Quote: Having problems with my 1978 dodge d100 318 engine, suspect a vacum leak on engine some where, carb is fine, ? is could a engine head gasket leak be casuing fuel loss of cylinder pressure on pistons 3,5, and 7 ???? or could it be the intake manifold gasket ???? Been banging head on this one, friend is helping and he is stumped as well, we just have possibilities right now, if any one has advice or answers please comment or send a message, PLEASE HELP !!!!!!!!!!!! You've swapped a known good carb? If so, put a vacuum gage on it and see what it is. 1968 Barracuda Fastback 318-2BBL 904 2.76 Frost Blue Survivor 1970 Roadrunner 440+6 BBL 727 AT 4.10 SG Dana Blue Fire Metallic 1971 Cuda 340-4 BBL 4spd 3.91 SG Curious Yellow 1972 Barracuda 318-2 BBL 904 AT 3.23 1 Legger Tor Red/White Vinyl Top 2007 Dodge Ram 1500 5.7 Hemi AT Patriot Blue 2011 Dodge Challenger RT 5.7 Hemi 6spd 392 SG Triple Black 2014 Dodge Charger RT Max AWD 5.7 Hemi AT 305 Billet Silver

Re: 318 engine probs HELP !!!! [Re: TimS] #1315618 10/05/12 08:49 AM 10/05/12 08:49 AM
Joined: Oct 2012 Posts: 6 S sandman13211 OP member
sandman13211 OP member S Joined: Oct 2012 Posts: 6	good carb, will check vacum leaks

Re: 318 engine probs HELP !!!! [Re: sandman13211] #1315619 10/05/12 10:37 AM 10/05/12 10:37 AM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	If it has good power and smooth off of idle, it usually is lean due to vac leak or crud in carb etc. If it has egr, take a look at it's operation too.

Re: 318 engine probs HELP !!!! [Re: sandman13211] #1315620 10/05/12 10:49 PM 10/05/12 10:49 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Welcome aboard! Need more details on what's going on, how it's acting what is it doing and when, recent occurance or gradual, any recent work or part changes live every 24 hour block of time like it's your last day on earth

Re: 318 engine probs HELP !!!! [Re: RapidRobert] #1315621 10/05/12 11:07 PM 10/05/12 11:07 PM
Joined: Jul 2007 Posts: 1,682 Philadelphia R radar top fuel
radar top fuel R Joined: Jul 2007 Posts: 1,682 Philadelphia	I'm confused too. Whats a "fuel loss"? Is Siri doing your typing? I fired her from writing my text messages.

Re: 318 engine probs HELP !!!! [Re: RapidRobert] #1315622 10/07/12 11:06 AM 10/07/12 11:06 AM
Joined: Oct 2012 Posts: 6 S sandman13211 OP member
sandman13211 OP member S Joined: Oct 2012 Posts: 6	just changed the intake manifold gasket yesterday, will see if that is the problem, what is happening is that there must be a vacum leak either in the intake or engine head due to the truck running rough, and my friend did a vacum test and things were all over the place ( before we replaced the gasket ) so keeping fingers crossed and also any advice would be great

Re: 318 engine probs HELP !!!! [Re: radar] #1315623 10/07/12 11:09 AM 10/07/12 11:09 AM
Joined: Oct 2012 Posts: 6 S sandman13211 OP member
sandman13211 OP member S Joined: Oct 2012 Posts: 6	just trying to relay what my friend told me while working on the truck, i'm more of a body man and he is the mechanic, he doesn't have a computer so I'm trying to help him out

Re: 318 engine probs HELP !!!! [Re: sandman13211] #1315624 10/07/12 11:10 AM 10/07/12 11:10 AM
Joined: Nov 2003 Posts: 12,494 Western Colorado High Desert moparmarks I Live Here
moparmarks I Live Here Joined: Nov 2003 Posts: 12,494 Western Colorado High Desert	Low commpression on 3,5 and 7? Probably the head gasket or worse. 72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/ motormangj@gmail.com

Re: 318 engine probs HELP !!!! [Re: sandman13211] #1315625 10/07/12 12:11 PM 10/07/12 12:11 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	So what are the compression test numbers??

Re: 318 engine probs HELP !!!! [Re: sandman13211] #1315626 10/07/12 12:49 PM 10/07/12 12:49 PM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	Check to see it there is alot of slack in the timming chain. Might be time for a new one.

Re: 318 engine probs HELP !!!! [Re: moparmarks] #1315627 10/08/12 11:25 AM 10/08/12 11:25 AM
Joined: Jan 2003 Posts: 2,931 P Paul_Fancsali master
Paul_Fancsali master P Joined: Jan 2003 Posts: 2,931	Number 7 likes to blow to outside from what I have seen Good chance it is a blown head gasket 10 bolts Use a good gasket and forget it By the way if the cylinders are over 90 lbs I would not loose any sleep over it the comp on those year 318 engines was low.

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