I have a 91 z28, 305 tpi , 55k and in in mint shape. Last yesr I had one fuel injector replaced. This summer it started running rich again and had code read and injectors ohm tested. Found 3 more injectors are bad.
Is this a common problem with these TPI systems? Where can I get the least expensive injectors? Should i get used ones from the wreckers? Your advice would be appreciated.

 

Just finished a 350TPI swap in to my car. Rebuilt the whole motor to find 4 bad injectors. I have heard that the grey injectors(rochester I think) go bad pretty often. Just got 8 new ones so I didn't have to mess with them again. I went to www.gmpartsdirect.com, part number 17112285 for the 350, not sure of the part number for 305, priced them there and had the local gm dealer price match, minus shipping and handeling. If they won't match the price, gmpartsdirect I think is around $650 for a complete set, where the gm dealer will be about $1000. Don't know about salvage yards. Best of luck to you.

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89'Camaro Convertible,96'firebird wheels,79'Z28 hood scoop,soon to be a 350 tuned port injection engine, 3.27 posi disc brake rearend,36mm front sway bar, 24mm rear bar, all donated by a 89'Formula 350, Poly sway bar bushings and end links, Dark yellow green paint from Bonnevilles, tan Mr. Mikes leather interior,Macewen white face gauges.
Dreaming of a RamJet 350,
Jet fan switch
180 degree thermostat
Flowmaster cat back system
2nd place is always the first loser!

 

Why pay 650 for a set when you can pay 200 and get Accell injectors that will work just as good ?? Go to www.summitracing.com and order a set of 19pound Accell injectors for under 200 bones.

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1991 Z28 5.7 TPI

ZZ4 heads, ZZ4 cam, Harland Sharp roller rockers, Accel base, SLP siamesed runners, 52MM SLP Throttle Body, Hooker Headers, Flowmaster catback, MSD6A ignition, Home made ramair system, aluminum driveshaft, WC 5-speed etc

 

I just put in a set of twenty four pounders in my 5.7 and they run great, I bought them from Chuck Leeper @ cody motorsports in Lawrenceville Ga. He is a super nice guy and has better prices than summit, and he flows them for you and sends the flow sheet with it... b.t.w. they are accel's Tel. # 770-995-1106.

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89 iroc 5.7 bored .030 over, fully balanced, wisco flat tops, comp cams hyd. roller,adj. fuel pressure regulator, ported plenum, ported heads, modified air box w/ ram air, jet air foil,accel supercoil w/ 8.8 mm wires,ARP bolts,custom chip, griffin radiator, cat. converter test pipe w/ dynomax exhaust, edlebrock headers w/ ceramic coatings, 700r4 w/ many mods. 13.98 @ 103

 

I too have a bad injector(s) and have heard a lot of good things about Ford SVT injectors. They fit perfectly in that the connectors are the same and they are cheap ($280). I have heard bad things about Accel's so I'm going SVT's. You can get them from any Ford parts department.

My $0.02

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1986 IROC
LB9 305 TPI
Speed Pro forged pistons
Accel HEI Distributer
Cam & Crank from 96 Vette
Dynomax muffler
No cat

 

My bad, Ford SVO injectors. I must have had those patheticly slow SVT Lightning F150's on my mind. "Speed kills, buy a Ford live forever"

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1986 IROC
LB9 305 TPI
Speed Pro forged pistons
Accel HEI Distributer
Cam & Crank from 96 Vette
Dynomax muffler
No cat

 

Could you guys tell me wich Ford SVO injectors are equivelant to the TPI 350 injectors? Thanks

 

Trickle, I'd rather race a new Mustang than a new Lightning. They are pretty quick. I saw one run consistent 14.0's this year. The older ones do suck though.
Just be aware that Ford's 19# injectors were rated at a lower psi (37 psi I think) than GM's 19# (43 psi) so they will flow a little more. Should be alright though.

Bob


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350 TPI, 700R4(rebuilt), K&N's, MSD 6AL, Headers, Flowmaster, 160* stat, airfoil, MAF screens cut out. 13.88 @ 101.18 mph

 

Oops, youhave a 350. SVO jumps from 19 to 24#. Thats why I went with Accel (23#). I believe they are rated at the same psi as gm's. Accel also makes a 21# too.

Bob

 

Similar experience.

I just replaced two 19lb injectors for a '91 305. Low miles as well, about 45k. The car sat in a garage for 3 years before I bought it and sure enough the shielding on the injectors had begun disintegrating. My number 2 and 4 injectors were reading 5 ohms resistance and the car idled like garbage. Worked well at WOT which confused the local mechanics.

Along the way I discovered that the Multec style GM/Rochester injectors of '89-'90 vintage are pretty much guaranteed to die because of their design. Apparently the fuel eats the insulating material on the windings. Idiots. What kind of design is that ?

So I bought 8 used ones for $50 from the classifieds at 3rd gen and am using them as spares. Seems I'll be needing them.

RP.






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'91 Formula Firebird G92,WS6,5-speed,3.42 a ton of fun to drive.

 

The accel injectors are made by Bosch. Bosch is a well reputed manufacturer and have been in the fuel injection buisiness a long time. I would buy a set out of summit for around 200, just like the guy said earlier. By the way, I run bosch 24 lbs. in my 350 and never had any problems.

 

I don't know anything about fuel injectors. What range of resistance should they be in? How do I know if they go bad? Is it really obvious like palric's experience with the car idling badly?