just rebuilt engine and it seems to lug

JAMES ADKINS · Post by **JAMES ADKINS** » Wed Jun 24, 2009 8:54 am

Hi everyone, I just rebult engine on my 82 rabbit and i timed it according to Hagars hillbilly tuning with the only prob. being i ran out of slot while still gaining performance without preignition, so i need to backup one tooth on IP. to gain more. Ok so now to my question, does a diesel tend to buck more under heavy load before downshifting like a gas engine does with IP slightly retarded? my Jetta refused to ever buck and seemed to be about as smooth as an electric motor as far as loading it down goes. I once Had an Audi that did the same bucking thing when loaded heavily and it was tuned by ear. Anyone with experiance with this please help.

82vdub · Post by **82vdub** » Wed Jun 24, 2009 9:31 am

Gas or diesel - it's my opinion that if you are running the car in too high of a gear for the speed of the car and the load exerted on it so as a result it bucks, you are not shifting the transmission properly. You run a serious risk of damaging internal engine and transmission components and external drivetrain components when you load an engine to the point of causing it to buck. In other words, learn to shift the car so that it doesn't come close to bucking. Don't kill your car by doing this!

JAMES ADKINS · Post by **JAMES ADKINS** » Wed Jun 24, 2009 12:29 pm

Thanks for your reply 82vdub but i guess i did'nt fully make the issue clear. As far as learning to shift i can assure you i know when a car needs shifted or i certainly would'nt have survived long driving 18 wheelers in my earlier day's. What i'm trying to express is this engine is not as user friendly and seems to need shifting much more often than same engine type in my Jetta. For instance when i run Ac i have to actually slip clutch more on this one on takeoff than on the Jetta when i had AC on with it. I've looked up tranny code and it's supposed to be almost identical gearing as the Jetta. My 1st. gear for instance is as low as the other one so why the extra slipping of clutch? I can only summise my torq. level is off.

82vdub · Post by **82vdub** » Wed Jun 24, 2009 2:45 pm

I guess if it happens at speeds where you're slowing down and not always from when leaving a stopped position, then you may have an issue with the pump timing, injectors or something wrong with the pump. If it was only happening when slipping the clutch to get the car moving or on shifts, that could be a clutch slippage/chatter issue. But, based on your comment about downshifting in the original post, it could be one of the items listed above. I did have a bad injector a while back where the engine flat out wouldn't run a specific RPM. The slightest push or pull back on the throttle when you were right at that edge point had a large change in engine RPM. When in first gear and if you held the throttle at the right point, the engine and car would surge and it would get progressively worse, unless you moved the throttle to open or close it more. It was less noticable in other gears, but there in all gears at that specific engine RPM. That definately was an injector issue for me.

hagar · Post by **hagar** » Sat Jun 27, 2009 10:55 am

JAMES ADKINS
Diesel Freak : Please put you location on profile.

hagar .

Thank you.

Golf/Jetta · Post by **Golf/Jetta** » Sun Jul 12, 2009 10:40 am

high rpm to idle rpm in certain gears
it buck then at a certain spot

JAMES ADKINS · Post by **JAMES ADKINS** » Sun Jul 12, 2009 11:07 am

Yes thats exactly what it's doing and it's not altogether load related but seems to have a sour spot on throttle. I dsid see a few air bubbles when running up engine and it has a rpm range that it studders at. Remember i completely rebuilt engine and used a newish head with only 6000 miles on it so i don't suspect injectors but they can be changed out easily. If i figure something out i'll report back.

Golf/Jetta · Post by **Golf/Jetta** » Sun Jul 12, 2009 3:16 pm

on mine its high rpm to idle, it bucks (at a certain gear/spot [4th]). but acceleration it doesn't do this, just deaccelerating in gear (4th). (as if one cylinder is still getting fuel)

turn the smoke screw down it changed position (lower)

i ended up doing a head rebuild not too long ago. may have gotten dirt/peice of leaf in the line or injector during the rebuild (it was windy) but haven't solved the problem yet..

JAMES ADKINS · Post by **JAMES ADKINS** » Wed Jul 15, 2009 5:43 pm

Yeah i'm about to put my old injectors in this thing. Sometimes i can be going along & it will speed up slightly and then slow right back down. Wierd and definately not as smooth as it ought to be.

82vdub · Post by **82vdub** » Wed Jul 15, 2009 6:07 pm

Why not replace the nozzles in the injectors, one at a time and see if one, or all, solve your issue?

JAMES ADKINS · Post by **JAMES ADKINS** » Thu Jul 16, 2009 7:15 am

Yeah that would probably be best but here's my thoughts. I have a 1.6 that i tookout of service that ran as smooth as silk so i was thinking of doing an injector swap and while all injectors are out do a compression check as i just rebuilt the lower end of this baby 300+ miles ago. I know i should get a few more miles on her first to let the rings settle in but i also would like to quickly resolve this issue. Anyways when i get a resolution to it i'll post the cure. Also just thinking my IP may be a little off as well ? Thanks

82vdub · Post by **82vdub** » Thu Jul 16, 2009 8:48 am

My point was why take the time to swap out to old injectors? I had an engine speed problem a while back and when I rebuilt the injectors, the problem went away. I had thought it was a bad IP rebuild, but apparently not. You've got a new engine, why not keep fresh injector nozzles in it?

hagar · Post by **hagar** » Thu Jul 16, 2009 9:10 am

James Adkins : running out of slot ? , ergo it was not "Hillbilly-TUNED" according to hagar.

SO ? start all over again. . Takes about an hour, to do.

hagar.

JAMES ADKINS · Post by **JAMES ADKINS** » Thu Jul 16, 2009 9:26 am

Yeah i did run out of slot but what makes me not simply advance IP 1 tooth is that it does'nt seem to speed up any when i pull cold start. I was understanding that it should advance slightly and speed up motor when ildleing normally if it's not timed too far advanced. So i guess you all can tell i'm really not sure if i should just work more on timing first, rebulid/replace injectors or what. One things for sure i appreciate all advice and ideas and will report back which if not all these things clears it up. Again thanks

rabbit_man · Post by **rabbit_man** » Thu Jul 16, 2009 2:24 pm

JAMES ADKINS wrote:Yeah i did run out of slot but what makes me not simply advance IP 1 tooth is that it does'nt seem to speed up any when i pull cold start. I was understanding that it should advance slightly and speed up motor when ildleing normally if it's not timed too far advanced.

'82s have the timing advance knob but they don't have the high idle device.

Former VWDieselParts.com Forum

just rebuilt engine and it seems to lug

just rebuilt engine and it seems to lug

Location on profile.

"TUNING" not "TIMING".