Could this be the timing chain (351W)?

blk88lx · 02-18-2004, 08:23 PM

Ever since I put an EFI 5.8 in my 93 it ran rough at low speed. This included a miss at idle and some bucking and hesitation. Fine at higher RPM. Never bothered me too much but now I'm headed to Europe w/the car so I want it perfect.

Someone on the board told me to replace the O2 sensors. Did that, the car is better, almost. Still have a little bit of the problem.

I believe the 5.8 was out of a truck (it now has GT-40 lower, cobra upper, 24 LB inj, 73 mm mass air, 70 m throttle b, adj press reg, bigger fuel pump). Someone told me that the timing chain may not be compatable w/my HO computer and that I should get an HO timing chain.

Something about ford wanting more torque out of the truck 5.8s so they changed the timing chain.
This sound reasonable?

RoadWarrior · 02-18-2004, 11:57 PM

I dont see how a cam could have anything to do with the computer. Its just there to connect the crank to the cam. There are different types of chains but they all do the EXACT same thing. The only possibility is if its getting worn then you would start to lose timing. But the type of chain doesnt affect the computer.

tireburner163 · 02-19-2004, 12:33 AM

Kick who ever told you that in the nuts. The idea of the timing chain not being compatable in this case is ludicrus.

-Josh, aka the tireburner

QuantumMotorsports · 02-19-2004, 12:53 PM

Every time I have had a fuel injected 5.0 engine that doesn't run properly, it is because of an electrical problem. The windsor short block mechanicals are usually really stout (except for some of the older timing chains that have plastic coatings, but if this was bad, the engine would run horribly at all RPM and maybe not even run at all) I would get a scan tool possibly to see if you can find where the problem lies. Most likely an electrical/sensor problem.

jonnyk · 02-19-2004, 02:57 PM

Sounds more like a timing issue to me. What distributor do you have in it and what base timing advance?

blk88lx · 02-20-2004, 06:56 PM

I'll have to check on the timing. I know the distributor is a stock unit, off a truck I would presume. There is now way that a timing chain could cause a miss?

jonnyk · 02-21-2004, 12:00 AM

Nope.

Dark_5.0 · 02-21-2004, 12:49 AM

I would check the plugs, rotor. wires and cap a miss is almost always ignition related.

blk88lx · 02-21-2004, 11:30 AM

OK, I guess you guys saved me from doing the chain for no reason. I'll look at the other stuff

02-18-2004, 08:23 PM	#1
blk88lx Registered Member Join Date: Jun 2001 Location: Fort Leonard Wood, MO Posts: 179	Could this be the timing chain (351W)? Ever since I put an EFI 5.8 in my 93 it ran rough at low speed. This included a miss at idle and some bucking and hesitation. Fine at higher RPM. Never bothered me too much but now I'm headed to Europe w/the car so I want it perfect. Someone on the board told me to replace the O2 sensors. Did that, the car is better, almost. Still have a little bit of the problem. I believe the 5.8 was out of a truck (it now has GT-40 lower, cobra upper, 24 LB inj, 73 mm mass air, 70 m throttle b, adj press reg, bigger fuel pump). Someone told me that the timing chain may not be compatable w/my HO computer and that I should get an HO timing chain. Something about ford wanting more torque out of the truck 5.8s so they changed the timing chain. This sound reasonable? __________________ 93 GT, 5.8 EFI usual bolt ons, 3.55's, subs, hurst, K+N 78 F100 Short bed, 5.8, dual pipes 4 bbl 03 Sable

02-18-2004, 11:57 PM	#2
RoadWarrior Registered Member Join Date: Apr 2000 Location: Edmonton,Alberta,Canada Posts: 317	I dont see how a cam could have anything to do with the computer. Its just there to connect the crank to the cam. There are different types of chains but they all do the EXACT same thing. The only possibility is if its getting worn then you would start to lose timing. But the type of chain doesnt affect the computer. __________________ Fast Company

02-19-2004, 12:33 AM	#3
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	Kick who ever told you that in the nuts. The idea of the timing chain not being compatable in this case is ludicrus. -Josh, aka the tireburner __________________ 1987 Buick T-type 1998 HD Electra Elide

02-19-2004, 12:53 PM	#4
QuantumMotorsports Registered Member Join Date: Jul 2000 Location: Norman, Oklahoma, USA Posts: 597	Every time I have had a fuel injected 5.0 engine that doesn't run properly, it is because of an electrical problem. The windsor short block mechanicals are usually really stout (except for some of the older timing chains that have plastic coatings, but if this was bad, the engine would run horribly at all RPM and maybe not even run at all) I would get a scan tool possibly to see if you can find where the problem lies. Most likely an electrical/sensor problem. __________________ Michael Black QuantumMotorsports Norman, OK 1984 LX Hatch 306 w/ TRW forged flat toppers, Comp Cams Magnum 292H, GT40P heads w/ 3 angle valve job, .550 lift springs, Angus Racing Roller Rockers, Weiand Stealth Intake, Holley 4150 650cfm carb, MAC 1 5/8 Long Tubes, Single Chamber Flowmasters, 91' T5 w/ Pro 5.0 shifter, Turbo Coupe 8.8 Rear w/ 3.55 gears, QA1 Motorsports tubular K member, no interior except steering wheel and seat. Coming soon: 6 or 8 point cage, Fuel Cell, Weld Draglites

02-19-2004, 02:57 PM	#5
jonnyk Being stroked is great Join Date: Oct 1998 Location: Alberta, Canada Posts: 772	Sounds more like a timing issue to me. What distributor do you have in it and what base timing advance? __________________ Novi 2000 now spinning off the snout of the 331... Mods Pics

02-20-2004, 06:56 PM	#6
blk88lx Registered Member Join Date: Jun 2001 Location: Fort Leonard Wood, MO Posts: 179	I'll have to check on the timing. I know the distributor is a stock unit, off a truck I would presume. There is now way that a timing chain could cause a miss? __________________ 93 GT, 5.8 EFI usual bolt ons, 3.55's, subs, hurst, K+N 78 F100 Short bed, 5.8, dual pipes 4 bbl 03 Sable

02-21-2004, 12:00 AM	#7
jonnyk Being stroked is great Join Date: Oct 1998 Location: Alberta, Canada Posts: 772	Nope. __________________ Novi 2000 now spinning off the snout of the 331... Mods Pics

02-21-2004, 12:49 AM	#8
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	I would check the plugs, rotor. wires and cap a miss is almost always ignition related. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

02-21-2004, 11:30 AM	#9
blk88lx Registered Member Join Date: Jun 2001 Location: Fort Leonard Wood, MO Posts: 179	OK, I guess you guys saved me from doing the chain for no reason. I'll look at the other stuff __________________ 93 GT, 5.8 EFI usual bolt ons, 3.55's, subs, hurst, K+N 78 F100 Short bed, 5.8, dual pipes 4 bbl 03 Sable

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