Hard starts after LS3 is driven.
Thread Starter
Joined: Jun 2008
Posts: 618
Likes: 57
From: Houston/Clear Lake, TX.
Hard starts after LS3 is driven. I'm having trouble starting my Trans Am after the engine is at normal operating temps and I'm looking for a solution to fix this problem.
The car starts right up when it's a cold start. After the car has been ran, it turns over for about for 3-7 secounds before it starts.
A little about my 2000 Trans Am:
-Compression is about 10.43:1
-LS3 -Trick Flow heads and their cam
-92mm NW throttle body
-Supposedly tuned by Pat G and I seen a video of it been tuned at his shop. (I bought the car with all the modifications)
Any suggestions on the solution?
-Look at the tune again?
-Better/stronger starter with more torque?
The car starts right up when it's a cold start. After the car has been ran, it turns over for about for 3-7 secounds before it starts.
A little about my 2000 Trans Am:
-Compression is about 10.43:1
-LS3 -Trick Flow heads and their cam
-92mm NW throttle body
-Supposedly tuned by Pat G and I seen a video of it been tuned at his shop. (I bought the car with all the modifications)
Any suggestions on the solution?
-Look at the tune again?
-Better/stronger starter with more torque?
Thread Starter
Joined: Jun 2008
Posts: 618
Likes: 57
From: Houston/Clear Lake, TX.
It's been doing it since I bought it.
TECH Resident
Joined: Aug 2011
Posts: 828
Likes: 11
From: 4o5
I've developed this issue as well. To add on what has already been mentioned from what I found it could also be your battery. It puts more stress on the battery to start up a warm car rather than a cold start up, so if the battery is going bad that could be the culprit. Another thing it could be is the fuel pump. Same as the battery it's harder on the fuel pump to start a warm car rather than a cold one. Could be a sign the fuel pump is beginning to go.
Hope these other suggestions help you out
Hope these other suggestions help you out
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Verdad Gallardo Thread Starter
Joined: Jun 2008
Posts: 618
Likes: 57
From: Houston/Clear Lake, TX.
Thread Starter
Joined: Jun 2008
Posts: 618
Likes: 57
From: Houston/Clear Lake, TX.
I've developed this issue as well. To add on what has already been mentioned from what I found it could also be your battery. It puts more stress on the battery to start up a warm car rather than a cold start up, so if the battery is going bad that could be the culprit. Another thing it could be is the fuel pump. Same as the battery it's harder on the fuel pump to start a warm car rather than a cold one. Could be a sign the fuel pump is beginning to go.
Hope these other suggestions help you out
Hope these other suggestions help you out
Fuel pump...man....that doesn't sound fun. I'm not the type to cut my car up either.
Thanks for the tips.👍🏼
Thread Starter
Joined: Jun 2008
Posts: 618
Likes: 57
From: Houston/Clear Lake, TX.
I'm going to have to check the fuel pressure now that everyone is pointing it out, because I haven't.
TECH Fanatic
Joined: Nov 2011
Posts: 1,367
Likes: 144
From: Woodstock, GA
Check your fuel pressure ... and check for any vacuum leaks. I had a hard start issue on my LS1 several months ago and it turned out to be some old vacuum lines from the PCV system. It was harder to start after it was warmed up ... and it also stumbled a bit when it did start.... from the vacuum leak.
Thread Starter
Joined: Jun 2008
Posts: 618
Likes: 57
From: Houston/Clear Lake, TX.
Ok, I THINK I need a new fuel pump.
When I turn the key to ON (not crank the engine) the fuel pressure sometimes goes up to 58psi.
Sometimes it stumbles around 20ish up to 55ish. That when the car stubbles to start.
Then while driving the fuel pressure starts dropping from 58psi.
3,500rpm to50psi
5,700rpm to 40psi.
Any recommendations? LS3, TF heads, TF cam, SE LT and duel exhaust, 92mm NW throttle body.
When I turn the key to ON (not crank the engine) the fuel pressure sometimes goes up to 58psi.
Sometimes it stumbles around 20ish up to 55ish. That when the car stubbles to start.
Then while driving the fuel pressure starts dropping from 58psi.
3,500rpm to50psi
5,700rpm to 40psi.
Any recommendations? LS3, TF heads, TF cam, SE LT and duel exhaust, 92mm NW throttle body.
Thread Starter
Joined: Jun 2008
Posts: 618
Likes: 57
From: Houston/Clear Lake, TX.