LS Vtec acceleration problems
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Honda-Tech Member
Joined: Jun 2009
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From: Puerto Rico
LS Vtec acceleration problems
hi guys, I'm having problems with my car bogging and misfire when try to accelerate.
The car is tuned, this start suddenly like a TPS symptom bogging a little at take off and every day getting worse to the point now isn't drivable. The engine rev in neutral but in gear when you start to release the clutch bogs and die whit the wideband to lean, if press quickly the clutch the car stay like 400 rpm's. The car not have CEL, ATM can't datalog, the engine have every sensor changed and Distributor. Time is on spot and new ECU.
For example new plugs, let the car warm till the fan come on rev. it to 3.5k for a few seconds and take it to 7.5k and shut down:
https://honda-tech.com/attachment.ph...1&d=1396034524
https://honda-tech.com/attachment.ph...1&d=1396034524
The car is tuned, this start suddenly like a TPS symptom bogging a little at take off and every day getting worse to the point now isn't drivable. The engine rev in neutral but in gear when you start to release the clutch bogs and die whit the wideband to lean, if press quickly the clutch the car stay like 400 rpm's. The car not have CEL, ATM can't datalog, the engine have every sensor changed and Distributor. Time is on spot and new ECU.
For example new plugs, let the car warm till the fan come on rev. it to 3.5k for a few seconds and take it to 7.5k and shut down:
https://honda-tech.com/attachment.ph...1&d=1396034524
https://honda-tech.com/attachment.ph...1&d=1396034524
Re: LS Vtec acceleration problems
It bogs when the wideband reads lean. Thats a major clue. Figure out why its lean now. Fuel pump dying? Bad FPR? Maybe old fuel filter? Do you have a fuel pressure gauge?
Thread Starter
Honda-Tech Member
Joined: Jun 2009
Posts: 1,127
Likes: 1
From: Puerto Rico
Re: LS Vtec acceleration problems
Compression is 195-200 across the board dry test.
Yes, the wideband is 14.8-15.0 at idle as soon I press the gas it's go completely to lean, if I feather the throttle it rev's in neutral. Even with the charge pipe disconnected it do the same.
Replace a perfect walbro for a new one to be sure, change the 30amp relay and new fuel filter. The FPR is brand new AEM (to replace the command flow). I have pressure gauge but is in the filter (not press. drop in neutral), as soon my ECU return from AZ. going to put an extension to the wiper to see it, when try to drive it.
Yes, the wideband is 14.8-15.0 at idle as soon I press the gas it's go completely to lean, if I feather the throttle it rev's in neutral. Even with the charge pipe disconnected it do the same.
Replace a perfect walbro for a new one to be sure, change the 30amp relay and new fuel filter. The FPR is brand new AEM (to replace the command flow). I have pressure gauge but is in the filter (not press. drop in neutral), as soon my ECU return from AZ. going to put an extension to the wiper to see it, when try to drive it.
I'm Huge In Japan
Joined: Apr 2008
Posts: 1,314
Likes: 2
From: the 615
Re: LS Vtec acceleration problems
If you changed every sensor my experience points to an improper TPS installation, which doesn't always throw a code. Could also be a vacuum leak, or a bad crank sensor in the dizzy.
You need to post a datalog or we can't/won't help you in the tuning section.
You need to post a datalog or we can't/won't help you in the tuning section.
Thread Starter
Honda-Tech Member
Joined: Jun 2009
Posts: 1,127
Likes: 1
From: Puerto Rico
Re: LS Vtec acceleration problems
Let me see what can I do, for datalog. My Ostrich went bad, so I cant use ectune and the new ECU arrives without CN2 header for crome pro that is what I'm using right now.
I send the ECU to the seller because the datalog header and the CEL not pop on when disconnect the MAP sensor. Report as soon the ECU arrives.
TPS is new and well installed, .50v closed 4.54 WOT. Testing the voltage directly at ECU pin d11.
I send the ECU to the seller because the datalog header and the CEL not pop on when disconnect the MAP sensor. Report as soon the ECU arrives.
TPS is new and well installed, .50v closed 4.54 WOT. Testing the voltage directly at ECU pin d11.
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