Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

TPI 5.0 still won't fire...

Thread Tools
 
Search this Thread
 
Old 01-30-2008, 01:16 PM
  #1  
Junior Member
Thread Starter
 
astroglyph21's Avatar
 
Join Date: Dec 2007
Location: Schnecksville, PA
Posts: 66
Likes: 0
Received 0 Likes on 0 Posts
Car: 1987 Chevrolet Camaro IROC-Z
Engine: LB9 305 TPI
Transmission: TH-700R4
Axle/Gears: G92 3.23
TPI 5.0 still won't fire...

Well, to make a long story short, car cranks and cranks and cranks, but still wont fire. Tried everything so far, swapped ecm's, fuel pressure is at 41 psi at the rails, new icm, coil, distributor, its getting spark, plugs are wet after cranking, and the injectors are getting power, not sure about a pulse yet since i havent been able to track down a noid light, car has strong compression in all cylinders, made no mechanical noise indicating an internal failure. umm...o yeah, and i also learned a valuable lesson about testing the fuel pressure, then 20 minutes later swapping a distributor and setting timing, fuel that sprayed out when hooking on the pressure gauge was sitting on the motor while we were setting timing, and it backfired out of the TB pretty good, lol...well, lets just say the engine bay looked like satan was about to make an appearance, and amen for the garden hose. That was fun, anyways, any ideas on what to check out next, i'm totally stumped. It seems like everything is working ok, and when you crank it it sounds like its about to fire up, but just wont idle. Thanks guys.
Old 01-31-2008, 12:58 PM
  #2  
Junior Member
Thread Starter
 
astroglyph21's Avatar
 
Join Date: Dec 2007
Location: Schnecksville, PA
Posts: 66
Likes: 0
Received 0 Likes on 0 Posts
Car: 1987 Chevrolet Camaro IROC-Z
Engine: LB9 305 TPI
Transmission: TH-700R4
Axle/Gears: G92 3.23
Re: TPI 5.0 still won't fire...

anyone have any thoughts?
Old 01-31-2008, 02:48 PM
  #3  
Supreme Member

 
ploegi's Avatar
 
Join Date: Jul 1999
Location: Adrian, Mi, USA
Posts: 1,551
Likes: 0
Received 25 Likes on 20 Posts
Car: 1988 Pontiac Firebird Formula
Engine: 5.7 TPI
Transmission: 700R4
Re: TPI 5.0 still won't fire...

What does your fuel pressure do if you prime the system, and then let it sit? It should hold pressure for a good long time, (it will bleed down 1-2 psi immediately) If it drops quickly, you have something leaking. How wet were the plugs? Got a scan tool that will show data?

You need fuel, air (in the correct proportions) and spark (at the right time) for the engine to run. You have spark and fuel, so, next step is to see if timing is correct, and if so, see about fuel....
Old 01-31-2008, 02:57 PM
  #4  
Senior Member

 
mnorton's Avatar
 
Join Date: May 2002
Location: Northern California, Redding
Posts: 845
Likes: 0
Received 0 Likes on 0 Posts
Car: Red 1987 IROC Convertible
Engine: 305 LB9 TPI
Transmission: T5 5-Speed
Axle/Gears: 9-Bolt 3.45
Re: TPI 5.0 still won't fire...

If it backfired out the intake the timing is wrong.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Cleotiz
Electronics
7
01-06-2018 08:56 PM
ASE doc
Alternative Port EFI Intakes
5
08-25-2015 09:14 AM
theurge
TPI
7
08-21-2015 12:46 PM
Sanjay
Engine/Drivetrain/Suspension Parts for Sale
1
08-12-2015 03:41 PM



Quick Reply: TPI 5.0 still won't fire...



All times are GMT -5. The time now is 05:28 PM.