Hesitant And Sluggish

[erbs 42 1 Cars]

My car has just started doing this

 

When the pedal is pushed down to pull away it is really sluggish and lacks power and kangaroos and when I put my foot down it clears but it's become undriveable

 

First places to look?

[welshpug 1,627]

afm & throttle body setup, also ignition timing.

[Alan77 78 1 Cars]

Worn dizzy cap or rotor arm? Old leads arcing?...

[erbs 42 1 Cars]

its all going for a refurb just wanted some advice so i was not wasting my money if no difference, thanks guys

[Alan77 78 1 Cars]

My advice would be to spend less than £20 on a cap and arm for your dizzy, just to check and rule it out, before sending it away for a £150 rebuild...

[erbs 42 1 Cars]

dizzy and leads and plugs and cap are all brand new

Edited April 1, 2016 by erbs

[Alan77 78 1 Cars]

Ok. The only other thing I can think of (apart from afm mentioned by wp) is head gasket. I had a head gasket go years ago and water was obviously getting across the gasket into the cylinders, causing all sorts of spluttering as it was trying to burn off moisture during firing.

If your HG is also newly done, then I'm out of ideas...

[GLPoomobile 958]

Also the ECU temp sensor, which could be causing overfueling.

[erbs 42 1 Cars]

engine rebuilt not long ago by me and brand new head gasket and ecu temp sensor is a brand new bosch one

 

the engine revs freely fron standstill, its just when its under load it hesitates

Edited April 1, 2016 by erbs

[j_turnell 134 3 Cars]

Have you taken the plugs out to see what they look like? Do you have a spare coil to try?

[erbs 42 1 Cars]

will have a look at the weekend when i get 5 mins

[erbs 42 1 Cars]

Very strange issue, the car revs when blipping the throttle but when i put my foot down it hesitates but does eventually get past this but of course making it impossible to drive.

Here is the video of it,forget about the tappety noise i got to fix this,i checked the plugs and they look fine as ihave recently put in a new fuel pump as it was running lean and hard to start

 

Keep an eye on my hand at the throttle body as it does this when i fully open it up or when driving it kangaroos down the road

 

http://vid253.photobucket.com/albums/hh49/ERBSS/IMG_1138_zps0jms5zvx.mp4

[steve@cornwall 100]

Above symptoms and a temporary noise would point me toward valve timing

[parv121 3]

Hi Jamie,

 

Now, I'm not one of the experienced very helpful gurus on this forum but I did once have the exact same problem as you describe and it ended up being my fuel pump. They can still work even though not at 100 %. When I was asking the car for more fuel ie: foot to the floor or , going up hill it done what you describe. Under load or full throttle.

Don't rule it out.

Especially if it was all running well and the suddenly start playing up on day. , fuel pump could be

[erbs 42 1 Cars]

just replaced the fuel pump with a bosch pump, was fine when fitted, i am going to check it again to make sure if anything has changed

[parv121 3]

Sorry Jamie , just watched ur video. Mine was not doing what urs is doing and didn't sound like that. When reving .

[parv121 3]

How much was pump, was it new, where did u get from, just for future

[erbs 42 1 Cars]

160 quid and was from mister auto

[Bobbafett 49 2 Cars]

Ignition amplifier? I had some cutting out under high load with a Bosch one. I fitted a pattern one as a replacement and the car ran like absolute s*it. Symptoms were very similar. Fitted a new (used, known good) Bosch blue one and problem solved.

[Ozymandis 96]

"hesitant and sluggish" must have this f***ing flu too, does it cough and whine as well?

[erbs 42 1 Cars]

Thanks for your replys guys, I must have a unique issue here that no one has ever seen before so I guess it's testing the components time

[Bobbafett 49 2 Cars]

If you can get a known good Bosch ignition amp then I would honestly start there. Put an ad up in Wanted and you'll get one quick sharp.

 

If you get stuck I do have a known good one but it's my spare so i'd need it back afterwards.

[tartanbloke 35 1 Cars]

Have you checked the distributor

[kyepan 291]

Looking at the video, is the throttle position static when it's revving in that oscillating fashion?

 

So you open it gradually until it oscillates up and down then hold it at the point when it is misbehaving. ?

 

My first guess would be that the afm flap is fluttering , have you refitted it recently and if so did you pay attention to the orientation as the flap has enough weight to do odd things if it's angled incorrectly. Odd things being like that suspension bridge that hit a harmonic and would twist.. When the wind was at a specific speed.

 

One way to check would be to disconnect the air intake up to the afm, then look down it as you reproduce the issue, if the flap is fluttering, or more likely if it doesn't do it.. Problem solved.

 

Reason why I think afm might be worth looking at is past 5000 the afm maxes out and that's why it runs clean t the top end...

[erbs 42 1 Cars]

Yes I am going to have a look at the AFM, I changed the ignition amp on Sunday for a known good one and little difference so the AFM will be next on the culprit list