Hi to all. I’m new here and its my first post. I have little problem with my 93 Honda del sol si. My engine is D16z6, It accelerates really slow until I reach the rev around 3,000-3,500 then the acceleration feels good... What could be the cause of this problem? I’ll tell you more things about the car; it may help you find the cause of my problem.


1. When I on the A/C, it accelerates much more slower that without A/C (really sucks), so i usually of the A/C then i want to move the car from stop position then after i reach the speed i want, i on the A/C again (its very hot here, cant take it without A/C...) actually, the compressor makes voices/noises when the A/C is one, and when I off the A/C, no more voice. So I believe the compressor is damaged and that could be the reason why the car is really10x slow when I on it, but can this affect the acceleration of the car if the A/C is off???


2. I have observed when I drive the car really fast and strongly accelerate or when I use the A/C, then I stop on traffic light, the rev wouldn’t be fix, it always go up and down (between 700-1,600) and keep doing this until I drive the car again. (Why does the car do that???)


Any help from you guys will be appreciated… if you need any clarifications please ask me.

Thank you!

 

Compressor isnt why your car is slow.

Could be many problems. ANything from, compression drop, Oil comsumption, Headgasket leak

Coolant has 100x the compression of gas and oil, so this would slow down the engine rotation.

a weak spark would reduce power and responce. Tune up!

Carbon buildup on valves would let compression drop.

Theres many things that can cause these problems. All you can do is start off with compression check, Combustion gasses in coolant. and keep going from there.

The Stock z6 isnt really that fast to begin with.

 

Com'on guys, 15 viewers no body replies???

 

Thanks buddy! but how can I know there is a carbon buildup on valves? do I really need to open the engine to check that? and what is the solution to that? clean it manually?

 

SEAFOAM!

buy some product that cleans the intake system. when was the last time you replaced the spark plugs?

 

Do a tune up. If your idle is surging like that you probably have a vacuum leak or maybe a dirty IACV. So check those out too.

As for the air conditioning making it slow, my car (97 Civic coupe) is like that as well. When the A/C is on I have to rev above 3k to get any type of normal power. I think it's just an underpowered Honda thing because mine runs great otherwise.

 

My D15B7 fell flat on it's face until about 3000 RPM, when it woke up. I had 180 compression on all 4 cylinders too. AC made it more noticeable. And yeah, a d16Z6 won't be "fast", so don't expect miracles, even with a tune-up.

fm

 

LOL!

 

I hope to do something close to that with my D16A6/Z6 build. P29's, milled LS rods, port/polish, balanced everything, exospeed stg 3 cam and a lot of tuning lol..

remember that Honda motors aren't designed for low-end torque like a V8, they are meant for high-rpm HP and 9-10K red-lines. That in combination with wide powerbands, long geared trannies, AND weighing 1700 lbs it makes for a pretty quick car.

 

Thanks to you all guys for your replies!

1. spark plugs already replaced 3-4 months ago.
2. I already cleaned my IACV one month ago, no difference noticed.
3. Yah, I dont expect my car to be that fast, its just SOHC.
4. Isn't it bad to rev the engine much up to 5,000 everyday? or bad for the engine??

any new ideas would be appropriated!

 

Check your ignition timing, I bet its off.

 

Just buy my car and all your problems will be over with, and A/C payceee..when you doing 140 you don't need it.

 

I was going to say the same thing or cam timing being off a tooth or two causes a very slow rev and loss of power

Did you change the timing belt recently?

 

thats what there made for my friend

 

Actually, I haven't change the timing belt since i bought the car (I already drove about 15,000 miles), I don't know when the previous owner has changed it. Is it better to change it now? can i do it by myself or it need a pro to do it?

Thanks

 

yah, i think so... Thanks!

 

No hondas, are built for that, thats why vtec doesnt engauge untill 5500

 

I'm not saying it is the cam timing but its a thought, it may or may not be....they are easy to change if you got the right tools and have done it before, but can be tricky if its your first time
A/C does rob more power than what most people think its a pure power killer whether on or off especially if the clutches in the compressor are engaged full time
I'd say check the cam timing first then ignition timing, both are easy and quick to check....and like most guys are saying, don't expect too much from a stock z6, 125hp at the crank isn't much that's why hondas get 40+mpg

 

Currently im using P0A ECU. Is this ECU compatible with my D16z6 engine? The original ECU is P28 for Honda del sol si. What is your advise? continue using P0A ECU and thats just fine or buy the original ECU of my car (P28)?

 

it should be running off a p28 ecu.... and you can still get 30mpg with turbo....40mpg has mostly to do with the long gear trannys like the y7 or a6. check the ignition timing maybe advance it some at the dizzy. have you ever done a compression test on the motor? you could possible do a valve adjustment on it and see if that helps at all. is your fuel mileage bad? or had the fuel filter changed lately?

 

You need a p28

Yep I get 27mpg mixed driving in my car which is a built turbo y8

 

def get p28 check valve adjustment,what size is your exhaust?dont go to big it will kill what little low end power u have

 

I know what he's talking about, it annoys me to no end. Compression is in the 180's across the board and I've done a MAJOR tune up, and I mean MAJOR, on my Del Sol with a D15B7. I put on a brand new IACV because mine was going bad anyway; I even change the catalytic converter thinking that it was clogged up. I've dropped nearly 800.00 and lots of my own time and after all that it's running no different.
I'm starting to lean toward it being some type of a voltage drop causing the problem because it is intermitting. Some days it runs great and some days it doesn't. When it runs sluggish under 3K there's lots of valve pinging and none at all under any amount of load after 3K when the power comes back. And it's not like I've got bad gas in there, I've tried all different grades from different stations.
I'm gonna start checking all the electrical grounds and battery cable next and maybe change the alternator. It could be the voltage regulator in the alternator going bad. Who the F*** knows, it pisses me off!

 

I want to make this a little bit clearer if he's having the same type of issue I'm having and it sounds like he is. This isn't a gradual increase of power that starts sluggish and builds up due to an underpowered motor in an overweight car. It's as if the motor is running at 50% power before 3K and it's as if someone hits a switch around 3K and you get a sudden burst back to 100%.

 

After owning a D16Z6, I think part of it is just the natural Torque-less Honda syndrome. Sure, it shouldn't be DRASTIC, there's no doubt there's a problem if it's bad that it jumps at 3000. But my '93 does the very same thing, but lightly. It isn't very quick below three thousand, but it gets a little more lively at 3000, and then VTEC kicks in at about 4600-4800 (Can't remember the stock kick-in, but I think whoever owned it before me has messed with the computer stuff). The D16Z6 just naturally is that way in a Del Sol. Del Sol's, I've heard are 2800 pounds, because of the rear window motor and removable top and extra bracing in the rear because of the top. I go through the same thing and my D16Z6 only has 4000+/- miles on it, bored up one size, completely clean and almost like new. I've heard another former Del Sol owner that felt the same thing. Hondaguy81 pretty much has it, the power to weight ratio isn't very good.