A Bit of Lag From About 3.5 to 4.5 RPM
- Thread starter E92
- Start date
Obviously, a tune-up if you haven't done so in a while.
After that, I would check the ignition system. Check the plug wires and resistance check the ignition coil.
A vacuum leak would cause issues all across the board. Issues that surface in the upper RPM range tend to fall on ignition issues. EGR is dis-engaged on wide open throttle, so if you suspect an EGR, you would see if the lag is there on partial throttle versus wide open, but again, an EGR issue would show problems all across the RPM range once the engine warmed up.
After that, I would check the ignition system. Check the plug wires and resistance check the ignition coil.
A vacuum leak would cause issues all across the board. Issues that surface in the upper RPM range tend to fall on ignition issues. EGR is dis-engaged on wide open throttle, so if you suspect an EGR, you would see if the lag is there on partial throttle versus wide open, but again, an EGR issue would show problems all across the RPM range once the engine warmed up.
The engine is 4AGE red top 115 hp from the 1988 Corolla GTS. It's fuel injected. I don't think it's the EGR if what was said is true. Before and after tune up it should be there.
The engine maybe has ....40,000 miles? I have to look at my records but the head was rebuilt a long time ago. I recently rebuilt the head after changing the head gasket and I'm pretty sure everything in there is fine. I don't drive it often so it's a little foggy. The problem is always there even when it's cold.
It feels a lot like when this one time a long time ago when I changed to a 4-1 header and intake and I suddenly had lag around that RPM range. The problem didn't occur suddenly, I think it does start to get better after it warms up but right now I can't say in detail too much about those kinds of details because I don't drive it much and not for very long (stickers, the car is at another house that I don't visit often).
It's almost as if it's always been there in differing degrees after I changed the header the very first time. Right now it sounds like I should start checking the ignition systems, since the problem is definitely not across the powerband.
The engine maybe has ....40,000 miles? I have to look at my records but the head was rebuilt a long time ago. I recently rebuilt the head after changing the head gasket and I'm pretty sure everything in there is fine. I don't drive it often so it's a little foggy. The problem is always there even when it's cold.
It feels a lot like when this one time a long time ago when I changed to a 4-1 header and intake and I suddenly had lag around that RPM range. The problem didn't occur suddenly, I think it does start to get better after it warms up but right now I can't say in detail too much about those kinds of details because I don't drive it much and not for very long (stickers, the car is at another house that I don't visit often).
It's almost as if it's always been there in differing degrees after I changed the header the very first time. Right now it sounds like I should start checking the ignition systems, since the problem is definitely not across the powerband.
Well I guess technically it's a parking lot with cones... I'm not sure. But it's a local spot where I can run it on a autocross course. Right now the motor is back to stock... I had webcams in there, but I want bigger ones. After I change the flywheel and tighten my sway bar I'll try it and see what happens.
It's actually front wheel drive. From 1988 they started to make them FWD.
here's an older picture of it... the recent ones are not accessible where I'm at.
It's actually front wheel drive. From 1988 they started to make them FWD.
here's an older picture of it... the recent ones are not accessible where I'm at.