91 L98 just cranks sometimes starts
11-24-2017, 09:01 PM
#1
Member
Thread Starter
Join Date: Dec 2015
Posts: 132
Likes: 0
Received 0 Likes
on
0 Posts
91 L98 just cranks sometimes starts
So the car has not ran for a while. Anyway, it's mainly just cranking it barely starts. At first it would start for a few minutes, but then die. Then, it would just crank. Sometimes it'll start and die right away. As of right now it's just cranking. It'll start with starting fluid, but die right away. I've replaced the fuel pump, fuel filter, spark plugs, and battery. I pulled out the fuel pressure regulator and there was no signs of tears or anything unusual. What could it be? I've never driven this car and really want to. Thanks
11-24-2017, 11:07 PM
#2
Re: 91 L98 just cranks sometimes starts
I know you replaced the fuel pump and filter, but have you verified the engine is actually getting fuel? If it'll only turn over with starting fluid, I would think that its not. Check the fuel pressure at the rail and see if it has any. With the key on can you hear the fuel pump priming?
11-25-2017, 06:39 AM
#3
Member
Thread Starter
Join Date: Dec 2015
Posts: 132
Likes: 0
Received 0 Likes
on
0 Posts
Re: 91 L98 just cranks sometimes starts
I know you replaced the fuel pump and filter, but have you verified the engine is actually getting fuel? If it'll only turn over with starting fluid, I would think that its not. Check the fuel pressure at the rail and see if it has any. With the key on can you hear the fuel pump priming?
11-25-2017, 06:39 AM
#4
Supreme Member
iTrader: (1)
Join Date: Jul 2013
Location: *member since 1999, I think - just can't remember my old name, and the big site crash...*
Posts: 1,199
Received 151 Likes
on
105 Posts
Car: 89 GTA ASC Conv., Prev: 89 GTA 6.3L
Engine: 5.7L L98 TPI
Transmission: 700r4 Automatic
Axle/Gears: 3.27:1 w/ JG1 Options:B2L, N10, U1A
Re: 91 L98 just cranks sometimes starts
Have you tested the resistance in each fuel injector?
11-25-2017, 06:40 AM
#5
Member
Thread Starter
Join Date: Dec 2015
Posts: 132
Likes: 0
Received 0 Likes
on
0 Posts
11-25-2017, 06:50 AM
#6
Supreme Member
iTrader: (1)
Join Date: Jul 2013
Location: *member since 1999, I think - just can't remember my old name, and the big site crash...*
Posts: 1,199
Received 151 Likes
on
105 Posts
Car: 89 GTA ASC Conv., Prev: 89 GTA 6.3L
Engine: 5.7L L98 TPI
Transmission: 700r4 Automatic
Axle/Gears: 3.27:1 w/ JG1 Options:B2L, N10, U1A
Re: 91 L98 just cranks sometimes starts
Yes. Check each injector. Unclip the harness.
Should read 16 ohms at each injector.
Post your results in 15 min when done. Thank
Should read 16 ohms at each injector.
Post your results in 15 min when done. Thank
11-25-2017, 06:57 AM
#7
Member
Thread Starter
Join Date: Dec 2015
Posts: 132
Likes: 0
Received 0 Likes
on
0 Posts
Trending Topics
11-25-2017, 06:57 AM
#8
Supreme Member
iTrader: (1)
Join Date: Jul 2013
Location: *member since 1999, I think - just can't remember my old name, and the big site crash...*
Posts: 1,199
Received 151 Likes
on
105 Posts
Car: 89 GTA ASC Conv., Prev: 89 GTA 6.3L
Engine: 5.7L L98 TPI
Transmission: 700r4 Automatic
Axle/Gears: 3.27:1 w/ JG1 Options:B2L, N10, U1A
Re: 91 L98 just cranks sometimes starts
Key off
You are reading resistance across each injector pin and pin.,,
You are reading resistance across each injector pin and pin.,,
11-25-2017, 07:06 AM
#9
Member
Thread Starter
Join Date: Dec 2015
Posts: 132
Likes: 0
Received 0 Likes
on
0 Posts
Re: 91 L98 just cranks sometimes starts
So I'm not any good with this stuff, but I have my multimeter on 20K ohms? There's 2000K, 200K, 20K, and 2000, and 200. Which one is it supposed to be on? It's on the ohm area. Also I'm touching one terminal of the injector with the black lead and the red on the other one if that's how you do it?
11-25-2017, 07:15 AM
#10
Supreme Member
iTrader: (1)
Join Date: Jul 2013
Location: *member since 1999, I think - just can't remember my old name, and the big site crash...*
Posts: 1,199
Received 151 Likes
on
105 Posts
Car: 89 GTA ASC Conv., Prev: 89 GTA 6.3L
Engine: 5.7L L98 TPI
Transmission: 700r4 Automatic
Axle/Gears: 3.27:1 w/ JG1 Options:B2L, N10, U1A
Re: 91 L98 just cranks sometimes starts
11-25-2017, 07:50 AM
#12
Supreme Member
iTrader: (1)
Join Date: Jul 2013
Location: *member since 1999, I think - just can't remember my old name, and the big site crash...*
Posts: 1,199
Received 151 Likes
on
105 Posts
Car: 89 GTA ASC Conv., Prev: 89 GTA 6.3L
Engine: 5.7L L98 TPI
Transmission: 700r4 Automatic
Axle/Gears: 3.27:1 w/ JG1 Options:B2L, N10, U1A
Re: 91 L98 just cranks sometimes starts
2 of 8 are absolutely toast. 2 more are bad, and 4 are fine
Replace all eight (8)
I've used these on mine:
https://fuelinjectorconnection.com/c...l-injector-set
20% off sale, too.
Replace all eight (8)
I've used these on mine:
https://fuelinjectorconnection.com/c...l-injector-set
20% off sale, too.
11-25-2017, 07:52 AM
#13
Member
Thread Starter
Join Date: Dec 2015
Posts: 132
Likes: 0
Received 0 Likes
on
0 Posts
Re: 91 L98 just cranks sometimes starts
2 of 8 are absolutely toast. 2 more are bad, and 4 are fine
Replace all eight (8)
I've used these on mine:
https://fuelinjectorconnection.com/c...l-injector-set
20% off sale, too.
Replace all eight (8)
I've used these on mine:
https://fuelinjectorconnection.com/c...l-injector-set
20% off sale, too.
11-26-2017, 03:07 PM
#16
Supreme Member
iTrader: (1)
Join Date: Jul 2013
Location: *member since 1999, I think - just can't remember my old name, and the big site crash...*
Posts: 1,199
Received 151 Likes
on
105 Posts
Car: 89 GTA ASC Conv., Prev: 89 GTA 6.3L
Engine: 5.7L L98 TPI
Transmission: 700r4 Automatic
Axle/Gears: 3.27:1 w/ JG1 Options:B2L, N10, U1A