Bogs on stomp
Thread Starter
Advanced
Joined: Feb 2007
Posts: 55
Likes: 0
From: Perth Western Australia
Bogs on stomp
Hi all,
I've got a 1988 L98, auto, and while driving it home tonight, I tried to stomp it a little off the line @ the lights. It seemed to somewhat choke and bog down a little for a second before taking off. Kinda would make me look a bit stupid if I tried to drag a car (luckily i don't usually). It does this occasionally when i stomp on the accelerator, but not all the time. What could be the problem?
Thanks all!
- Jarrad
I've got a 1988 L98, auto, and while driving it home tonight, I tried to stomp it a little off the line @ the lights. It seemed to somewhat choke and bog down a little for a second before taking off. Kinda would make me look a bit stupid if I tried to drag a car (luckily i don't usually). It does this occasionally when i stomp on the accelerator, but not all the time. What could be the problem?
Thanks all!
- Jarrad
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Is the engine and setup stock?
What is base timing? Should be 6deg BTDC.
Are you launching off idle? If so try launching at say 1,000rpm.
Check the TPS setup.
Indeed it could be an injector issue but I'd eliminate the low $$ items first. I recently replaced injectors to fix just such an intermittent bog problem, after I had eliminated other potential causes.
What is base timing? Should be 6deg BTDC.
Are you launching off idle? If so try launching at say 1,000rpm.
Check the TPS setup.
Indeed it could be an injector issue but I'd eliminate the low $$ items first. I recently replaced injectors to fix just such an intermittent bog problem, after I had eliminated other potential causes.
Last edited by 65Z01; Apr 30, 2008 at 12:28 PM.
Melting Slicks
Joined: Jun 2005
Posts: 3,069
Likes: 83
From: Everyone needs something to believe in, I believe I'll have another beer. Wisconsin
I would also suspect the fuel filter, mine had the same bog down from a stop sign or red light and a new fuel filter took care of the problem.
Thread Starter
Advanced
Joined: Feb 2007
Posts: 55
Likes: 0
From: Perth Western Australia
Thanks for the replies all! I'll answer the questions I can, i'm not very mechanically minded as my father usually takes care of most things for me (i'm 21 and hes a mechanic :S).
The engine is stock setup as far as i'm aware, sure feels stock. Not sure about the timing, would have to check that. I believe im launching off idle, although idle in the car seems to be around 800-900 RPM...
Fuel read around 80km left in the tank, which is round 55 miles for conversion sakes (although at a really low mpg of around 13?). I've never replaced anything in the car since i've owned it except the brake booster, had it for around 2 years and its only a weekend car (i have a crappy 4cyl runaround car for all other needs). It also seems like it has a slight miss in the engine when the engine is running warm, doesn't seem like its making full power, if that has any bearing on the result. I've looked into another few threads with the same problem but have yet to get around to doing the checks...
Thanks so far!
- Jarrad
Is the engine and setup stock?
What is base timing? Should be 6deg BTDC.
Are you launching off idle? If so try launching at say 1,000rpm.
Check the TPS setup.
Indeed it could be an injector issue but I'd eliminate the low $$ items first. I recently replaced injectors to fix just such an intermittent bog problem, after I had eliminated other potential causes.
What is base timing? Should be 6deg BTDC.
Are you launching off idle? If so try launching at say 1,000rpm.
Check the TPS setup.
Indeed it could be an injector issue but I'd eliminate the low $$ items first. I recently replaced injectors to fix just such an intermittent bog problem, after I had eliminated other potential causes.
Was your gas tank low?
Could be the fuel filter is clogged - when's the last time you replaced it?
Just basic suggestions - could be more in depth.
Matthew
Could be the fuel filter is clogged - when's the last time you replaced it?
Just basic suggestions - could be more in depth.
Matthew
Thanks so far!
- Jarrad
Melting Slicks
Joined: Apr 2003
Posts: 3,110
Likes: 6
From: Red Sox Nation! RI
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Drifting
Joined: May 2007
Posts: 1,440
Likes: 19
From: SW Chicago Burbs IL
Fuel read around 80km left in the tank, which is round 55 miles for conversion sakes (although at a really low mpg of around 13?). I've never replaced anything in the car since i've owned it except the brake booster, had it for around 2 years and its only a weekend car (i have a crappy 4cyl runaround car for all other needs). It also seems like it has a slight miss in the engine when the engine is running warm, doesn't seem like its making full power, if that has any bearing on the result. I've looked into another few threads with the same problem but have yet to get around to doing the checks...
Thanks so far!
- Jarrad
You said it was low, it could be fuel sloshing around and that's why it bogged after a quick jump. Does it bog down when the tank is full?
Change the filter - it should be located under the passenger side rail beneath about the door seam. I'm not sure if your vette is converted to RHD based on the year and since you're down under, so I don't know if they moved the fuel lines to the opposite side.
I'd be more concerned about 13 mpg. That's pretty low. You might have other issues that need to be diagnosed. I'd look into that.
Here's a quick how to on changing the fuel filter. Even the mechanically challenged can tackle this job.
https://www.corvetteforum.com/techti...D=83&TopicID=2
Good luck,
Matthew
Racer
Joined: Jul 2007
Posts: 313
Likes: 0
From: Laurel MS
check your spark plug harness
Had a similar issue missed during hard acceleration and during any engine loading. Ops normal at cruise. Turned out to be a plug wire that chafted on the header. Shorty headers w wires routed underneath.
Thread Starter
Advanced
Joined: Feb 2007
Posts: 55
Likes: 0
From: Perth Western Australia
Just my .02 - I don't let my tank get below 1/2. The fuel pump is gas cooled, so it can shorten the life of the pump.
You said it was low, it could be fuel sloshing around and that's why it bogged after a quick jump. Does it bog down when the tank is full?
Change the filter - it should be located under the passenger side rail beneath about the door seam. I'm not sure if your vette is converted to RHD based on the year and since you're down under, so I don't know if they moved the fuel lines to the opposite side.
I'd be more concerned about 13 mpg. That's pretty low. You might have other issues that need to be diagnosed. I'd look into that.
Here's a quick how to on changing the fuel filter. Even the mechanically challenged can tackle this job.
https://www.corvetteforum.com/techti...D=83&TopicID=2
Good luck,
Matthew
You said it was low, it could be fuel sloshing around and that's why it bogged after a quick jump. Does it bog down when the tank is full?
Change the filter - it should be located under the passenger side rail beneath about the door seam. I'm not sure if your vette is converted to RHD based on the year and since you're down under, so I don't know if they moved the fuel lines to the opposite side.
I'd be more concerned about 13 mpg. That's pretty low. You might have other issues that need to be diagnosed. I'd look into that.
Here's a quick how to on changing the fuel filter. Even the mechanically challenged can tackle this job.
https://www.corvetteforum.com/techti...D=83&TopicID=2
Good luck,
Matthew
Cars still LHD so shouldn't be a problem checking where you say. I'd say my low MPG is due to me doing a lot of 'city' driving, plus keeping it in first drive. The engine tends to run rather crappy at low RPM in the second drive on the auto, since roads in Aus are low speed (30-37 MPH), I prefer to use a nicer but more fuel expensive gear.
All i know is the car doesn't feel like it has the stock 240HP it claims. Something wrong with the car which I haven't had the time or money to look further into. I guess that's the problem you face when you own an expensive import, parts are more expensive, and me not having a full time job also makes it a little difficult! Haha but that's all part of the fun.
Need to get my hands on a FSM and run through it and do all the tests i can!
Thanks for your help!
- Jarrad
Drifting
Joined: May 2007
Posts: 1,440
Likes: 19
From: SW Chicago Burbs IL
Jarrad -
There is an australian devoted corvette site, I can't think of the name of it off the top of my head. You might want to check there for some local guys. If you google it, I'm sure you can find it. Otherwise I could try to dig it up.
Just an idea.
Matthew
There is an australian devoted corvette site, I can't think of the name of it off the top of my head. You might want to check there for some local guys. If you google it, I'm sure you can find it. Otherwise I could try to dig it up.
Just an idea.
Matthew
