Sluggish Acceleration. Sr20de anyone have any suggestions.

[uvamosk]

I have a Sr20De in a S13 body.

When I set the timing close to where it should be at the Distributor. The car will idel around 1.1k or so I tried to use the Idel adj. screw and everything but it still Idels around 1.1 to 1.3k. I then Set the timing retarded enough to get it down to 800 to 700 rpm's. When I do that The car has no acceleration what so ever I can push the gas pedal to the ground and it feels so so so slow. When I turn the timing back up at the distributor to 1.1k rpms then it will take off great and has lots of Acceleration.

I have check the Vacume lines for any leaks and I can't seem to find any but then again its a Sr20De and I do not know what is suppose to go where.

If anyone has any input or things to try I'm game.

Thank you guys

[shrapnail]

leave the idle high?

check your normal replaceables.. plugs/wires

vacuum hoses are a good idea, I found a few on mine that had some leaks and thinking that may have cleared up a few things. As for where they go.. *shrug* as long as you only pull one at a time you should be alright; just replace everything that looks cracked//dry-rotted the hose is uber cheap

[uvamosk]

Yeah but keeping it at 1.1k is kinda bad on the engine isnt it? I mean it should be at 700 to 750 rpm stock.

I was kinda worried about premature engine failure.

Plugs/Wires could cause the Sluggish Acceleration?


Modified by uvamosk at 7:59 PM 3/24/2007

[uvamosk]

??

Anyone else please I would like to figure this out?

[streetspirit7]

This is just kind of a shot in the dark but couldn't the wrong spark plug gap cause a sluggish acceleration?

[EnthusiastMan]

The retarded timing is causing the sluggish acceleration. Set the timing with a light and leave it there. Your high idle is something else. Double check for vacuum leaks. A good trick is to take a water hose and spray all around your intake manifold and see if it makes your engine run rough. If it does then you have and vacuum leak. Also, check your TPS and IAC and make sure your throttle body is clean.

[uvamosk]

Thanks, man I'll just set the timing and go from there. The target Idel for a sr20de is 750rpm right.

How do I check the IAC I can do the TPS with Ohm meter and what is a common way to clean out a TB.

Thank you

[EnthusiastMan]

There is a black/yellow wire that run to the IAC. First, make sure you are getting 12V with the key in the "on" position. There is another wire coming from the IAC(can't remember which color) but it should have some kind of voltage when the key is in the "on" position. It might be a 5V reference that runs back to the ECU but I'm not 100% sure.

To clean the throttle body take some carb cleaner and a small wire brush and scrub the hell out of it.

And yes, the idle should be arouns 750-800 RPM's. The car might idle high upon start up then come back down, but that's normal.

[streetspirit7]

I had an uneven idle on my SR, I pulled the idle screw all the way out and cleaned inside there with some parts cleaner. Also I cleaned the MAF with a MAF cleaner I bought at advanced auto. Not sure which one helped but one of them helped the problem a lot.

[uvamosk]

Thanks guys, Yeah I am afraid of it being a vacume leak which I have never had luck tracking down in my history of car ownership.

StreetSpirit I am thinking of selling this 240sx and buying a coupe. I wish I could find one.

Thanks again guys see what i can come up with.

[shrapnail]

gl

as for spark plugs being able to cause sluggishness; definitely; if a plug is only igniting part of your fuel, or not igniting hot enough.. especially if it's doing it in some but not all cylinders too where it's causing balance issues..

Sparkplug gap also a good idea

but yeah.. do the timing first; clean things up as others suggested. If you don't want to rep your plugs at least check them and clean them up w/ gas or w/e. IAC seems like a decent idea, not something i've had to mess w/ as of yet.

If you are concerned about a vac leak i'd still say shotgun hoses. Just start yanking/replacing.

[uvamosk]

Yeah, I got it all fixed now, I have perfect acceleration and everything works fine.

Now I think I'm down to the IAC or maybe TPS as the car will idle at 1,100rpm but if i tap the gas pedal or hit the brake a coupe of times it will drop down to 800rpm and idle there rock solid till I take off and stop again.

[donmada]

what was the main problem i have the same thing happening 1st gear is real strong but 2nd and up wont go over about 4000 rpms please help

[cheapscheisst]

i can tell you exactly what's causing the sluggish acceleration... S R 2 0 D E _

[Seishuku]

I have an S14 SR20DE... Well, it's an SR20DE+T now, but anyway... I had a bit high idle too, around 1000-1100.I never really put much thought into it, the engine ran fine, plugs were fine, no vacuum leaks, the only thing I never really tried to do is actually SET the idle.

I did have some luck with having a longer section of piping between the throttle body and MAF (the MAF was right off the throttle with a single 70 degree bend).

The odd thing is, is that now that I have the motor turbo'ed, it idles right at around 800-900RPM. Go figure.