'96 LT4 Wont Start
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Instructor
Joined: Apr 2005
Posts: 111
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From: Los Angeles
'96 LT4 Wont Start
Hey guys,
My '96 LT4 wont start. It has 83k on it and runs great. The opti spark was changed maybe 5k ago along with the plugs. I've noticed on occasion that upon start up, the idle was really rough and just about died. But that was just an every once in a while deal and it didn't continue after driving. From what I've read in other posts in the past, it sounds like it may be the opti. What do you think.
My '96 LT4 wont start. It has 83k on it and runs great. The opti spark was changed maybe 5k ago along with the plugs. I've noticed on occasion that upon start up, the idle was really rough and just about died. But that was just an every once in a while deal and it didn't continue after driving. From what I've read in other posts in the past, it sounds like it may be the opti. What do you think.
Race Director
Joined: Aug 2003
Posts: 11,043
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From: San Jose Pat Tillman - American Hero
Originally Posted by Brian_B
Hey guys,
My '96 LT4 wont start. It has 83k on it and runs great. The opti spark was changed maybe 5k ago along with the plugs. I've noticed on occasion that upon start up, the idle was really rough and just about died. But that was just an every once in a while deal and it didn't continue after driving. From what I've read in other posts in the past, it sounds like it may be the opti. What do you think.
My '96 LT4 wont start. It has 83k on it and runs great. The opti spark was changed maybe 5k ago along with the plugs. I've noticed on occasion that upon start up, the idle was really rough and just about died. But that was just an every once in a while deal and it didn't continue after driving. From what I've read in other posts in the past, it sounds like it may be the opti. What do you think.
Race Director
Joined: Aug 2003
Posts: 11,043
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From: San Jose Pat Tillman - American Hero
Originally Posted by Brian_B
I had it in with a good Vet mechanic. If I recall correctly he said the pump looked fine and just replaced the opti.
Thread Starter
Instructor
Joined: Apr 2005
Posts: 111
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From: Los Angeles
No stripe. I assume I was looking for water begin thrown off the belt, but it didn't have that. Do you think a code should be appearing on the ODBII? Do I have to go through a sequence of commands to get the codes to come up or should they automatically appear when problems occur?
Race Director
Joined: Apr 2000
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From: Texas
Doubt it's the opti. It's everyones whipping boy.
Start with the basics.
Is the Service Engine Soon light illuminated? If yes, what are the codes?
Does it crank?
Does it try to start at all?
What's the fuel pressure?
After the fuel pump stops running, does the fuel pressure hold or immediately bleed down?
Pull the #2 plug and check for spark. Is there any?
Start with the basics.
Is the Service Engine Soon light illuminated? If yes, what are the codes?
Does it crank?
Does it try to start at all?
What's the fuel pressure?
After the fuel pump stops running, does the fuel pressure hold or immediately bleed down?
Pull the #2 plug and check for spark. Is there any?
Race Director
Joined: Aug 2003
Posts: 11,043
Likes: 3
From: San Jose Pat Tillman - American Hero
Originally Posted by Brian_B
No stripe. I assume I was looking for water begin thrown off the belt, but it didn't have that. Do you think a code should be appearing on the ODBII? Do I have to go through a sequence of commands to get the codes to come up or should they automatically appear when problems occur?
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Race Director
Joined: Apr 2000
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From: Texas
Originally Posted by Brian_B
No stripe. I assume I was looking for water begin thrown off the belt, but it didn't have that. Do you think a code should be appearing on the ODBII? Do I have to go through a sequence of commands to get the codes to come up or should they automatically appear when problems occur?
Thread Starter
Instructor
Joined: Apr 2005
Posts: 111
Likes: 0
From: Los Angeles
The service engine soon light was on but no codes. I thought it was on because the ignition is on. You know how some stay on to do a diagnostic during start up. I thought that was the reason. It cranks hard but no attempt to catch and start. I'll check the fuel pressure and get back to you.
Pro
Joined: Feb 2002
Posts: 565
Likes: 2
From: Chandler AZ
Mine just started acting up this morning with hard starting. Pull the vacuum line off the fuel pressure regulator and see if gas comes out from there. That's what mine is doing so it's off to the parts store for a new one. Seeya, Robert
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Instructor
Joined: Apr 2005
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From: Los Angeles
There is a brake pressue light on the instrument panel but I didn't see a fuel pressure light. I live in an apartment and don't have tools or the space unfortunately to check the plug or the pressure. It sounds like I have to have it towed to a dealer for the code scanning.
