Intermittent Hesitant Launch - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-25-2006, 10:02 AM   #1
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Default Intermittent Hesitant Launch

Okay, I think I know what the problem is, but I want some second opinions.

Occasionally, my car just doesn't want to go when you first hit the gas. No missing or anything, just not the power she normally has. After a little bit, maybe a couple of seconds, she'll jump and run just fine.

No codes. No unusual noises. Just below normal power at "take off".

Just a lack of the "oomph" we all enjoy so much when launching.
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Old 04-25-2006, 10:32 AM   #2
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I had the same issue in my 99. Check your fuel pressures.

I checked mine when I was having this issue and was only getting 37 lbs. at the rail. When I raced the engine, they dropped. So, I changed the fuel pump and fuel filter.

Not saying this is your issue for sure, but checking the fuel pressures would be a good start. Also, how old are your plugs and wires?
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Old 04-25-2006, 11:13 AM   #3
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Once you check the Dilithium Crystals...

Let'* ask how long ago your last tune up was.

(Yeah..he told me his thoughts)
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Old 04-25-2006, 12:49 PM   #4
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Default launch

Tune up, fuel pressures or clogged injectors or cat.
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Old 04-25-2006, 01:03 PM   #5
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I kinda figured it was the tune-up - Plugs are probably 1 - 1 1/2 years old now (When did my engine blow? Been there ever since).

I just wanted to get some second opinions, just in case I was in denial about a more major issue.

So, once the move is over, it'* plugs, maybe wires, and clean the Air Hog. She just got a good dose of injector cleaner (B12) a couple of weeks ago.

And I will ignore the Cat remark, just due to budget and denial issues...

Thanks folks!!!!
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Old 04-25-2006, 01:10 PM   #6
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The cat is the least likely, based on your symptoms, IMO. Your cat is more likely to give you fits after reaching temp and as you ask for more from higher rpms. So rest a bit easier, though a hi-flow cat is really not that expensive, when compared to plugs and a good set of wires.
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Old 04-25-2006, 01:22 PM   #7
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If you have access to a fuel pressure gauge, hook it up. Seriously.

I was in denial too about my fuel pump, until I hooked up a guage.
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Old 04-25-2006, 01:26 PM   #8
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Quote:
Originally Posted by vital49
If you have access to a fuel pressure gauge, hook it up. Seriously.

I was in denial too about my fuel pump, until I hooked up a guage.
Yes Boss! A dude at work, whop borrows my scanner, just bought a FPG.
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Old 04-25-2006, 11:10 PM   #9
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I had those symptoms because of a dirty throttle body. I dunno if S2 TB'* get as dirty and clogged as the older ones.
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Old 04-25-2006, 11:39 PM   #10
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I'm having this issue right now on the '04 as well. Think I'll try a bottle of injector cleaner and see what happens... 32K miles on it.
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