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Username Post: 98 1500 5.7 spfi to mpfi help , misfires        (Topic#131635)
LakeRat 
Member
Posts: 21

Loc: Georgia,USA
Reg: 12-26-05
05-15-06 04:13 PM - Post#935693    

I have the part numbers to convert my injection for continued misfires.Can anybody help with anything I might run into doing this myself? What all has to come off,Throttle body,thermistat housing etc. Thanks for any help and would I be better off just changing the popet valves as the parts guy said?

 
DeLong 
Banned Member
Posts: 2868

Loc: Rural Illinois
Reg: 06-06-02
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-15-06 04:50 PM - Post#935694    
    In response to LakeRat

Quote:

would I be better off just changing the popet valves as the parts guy said?




I dont know about your other questions but I can answer this one.NO!

Our shop mechanic did my conversion and it idles & runs much smoother. You wont be sorry you swapped.
00 Yukon SLT XL 5.3
98 Lumina Police Package 3.8
88 2500 4X4 5.7
87 Mustang LX 5.0
67 Mustang Fastback 289
65 Mustang Fastback 289


 
snowboarder161 
Member
Posts: 149

Loc: Cape Cod,MA
Reg: 08-12-04
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-16-06 02:24 AM - Post#935695    
    In response to DeLong

I installed this conversion on my truck when I replaced my intake gaskets. However all you need to do is to seperate the plastic upper half of the intake. You do not have too remove the throttle body or the thermostat housing, just unplug the wires and hoses.
1970 Corvette coupe 350

2004 GMC SLE Ex-cab 4wd 5.3


 
snowboarder161 
Member
Posts: 149

Loc: Cape Cod,MA
Reg: 08-12-04
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-16-06 02:35 AM - Post#935696    
    In response to snowboarder161

I should have also mentioned that if you have never loosened the fuel lines on one of these engines it is probably the only real difficult part of the job. There are three bolts IIRC, one 10 mm on the intake, a 9/16 on the rear of the head, and lastly I had to remove a bellhousing bolt to gain enough clearance to remove the intake but you may not need to go that extreme. When you get the new injectors set up to go in thier holes do a triple check that they're correct because they probably would'nt come back out gracefully.
1970 Corvette coupe 350

2004 GMC SLE Ex-cab 4wd 5.3


 
ZR1Trev 
Member
Posts: 23

Reg: 01-10-05
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-17-06 03:18 PM - Post#935697    
    In response to LakeRat

You have to remove the upper intake manifold and everything attached to it (lots of wires and hoses). It is not difficult, but it does take some time. I agree that removing the fuel lines is the worst part, because they are not easy to reach near the firewall.

If you are going to spend the time removing the upper intake, it is definitely worth doing the conversion rather than replacing the original poppet injectors.

See my previous post on this topic:

http://www.chevytalk.org/threads/showflat.php/Cat/0/Number/1262663/an//page/0/vc/1

ZR1Trev

 
LakeRat 
Member
Posts: 21

Loc: Georgia,USA
Reg: 12-26-05
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-17-06 03:39 PM - Post#935698    
    In response to ZR1Trev

Thanks Trev. Parts are on the way from direct. Did you use a step ladder?.Also do you just insert the new spiders in their correct port? Thanks again!

 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-18-06 05:25 AM - Post#935699    
    In response to LakeRat

IF you remove the upper plenum do yourself a huge favor and do the lower intake gaskets while you have everything apart. Go with the Felpro ones designed for sealing issues. They are rubber on metal instead of plastic with the rubber O-ring. I just put an engine into a 1998 Express that had hydraulic locked on startup after sitting for 2 weeks (it had bad intake gaskets which was unknown to the owner, coolant seeped into the #2 intake port, sucked into the cylinder, snapped #2 rod. 56,000 miles.
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
ratnfested 
Valued Contributor
Posts: 2924
ratnfested
Loc: Rochester, NY. USA
Reg: 03-13-00
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-18-06 09:52 AM - Post#935700    
    In response to 1983G20Van

I converted my Dad's truck. it is no big deal. Just make you pay attention to the numbers on the new injector unit when you put the injectors in the manifold.
Philip Ferrera
1977 Chevelle
1977 Malibu Classic
1986 Grand Prix
1995 Tahoe
2003 Impala LS
2004 Ski Doo REV
Street Machines of Rochester NY


 
ratnfested 
Valued Contributor
Posts: 2924
ratnfested
Loc: Rochester, NY. USA
Reg: 03-13-00
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-18-06 09:54 AM - Post#935701    
    In response to ratnfested

i used the plastic Fel-pro gaskets but I used sealer on the coolant ports. i talked to a couple others that do the same thing and have good luck. those special gaskets are kinda pricy.
Philip Ferrera
1977 Chevelle
1977 Malibu Classic
1986 Grand Prix
1995 Tahoe
2003 Impala LS
2004 Ski Doo REV
Street Machines of Rochester NY


 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-18-06 10:56 AM - Post#935702    
    In response to ratnfested

Quote:

those special gaskets are kinda pricy.




So is a crate engine at 57,000 miles.
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
ZR1Trev 
Member
Posts: 23

Reg: 01-10-05
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-18-06 01:57 PM - Post#935703    
    In response to LakeRat

LakeRat,

If you send me a PM with your email address, I can email you the GM instructions on how to install the new injectors. They are not really necessary, but it does show you how to route the hoses so that everything fits okay.

No I didn't use a step ladder, but I did used a stool and sometimes actually sat in the engine compartment.

ZR1Trev

 
LakeRat 
Member
Posts: 21

Loc: Georgia,USA
Reg: 12-26-05
Re: 98 1500 5.7 spfi to mpfi help , misfires
05-19-06 04:28 PM - Post#935704    
    In response to ZR1Trev

Thanks for all the help guys. Lower intake gaskets already replaced earlier. Thanks again Trev

 
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