Lack of power

[MarkBzero 296]

Weird fault I am struggling to diagnose and need you help/ideas.

Whilst driving yesterday at a steady 60mph down a straight road just cruising not accelerating or taking my foot off the pedal, the car hesitated and slowed down. Felt like me taking my foot of the gas for a few seconds, but I didn't. On pressing the accelerator it coughs and splutters then picks up again. Same thing happened 5-6 times, what do you think it could be?

Coil, plugs, leads, fuel filter don't fancy swapping everything and I we have a camping trip coming up so needs to be sorted.

[Thrashed 157]

Could the TPS be faulty?  

[Andi 495]

Sounds a bit fuelly

Andi 

[IanS 58]

very  much doubt ignition as opening throttle increases the pressure in the cylinder at spark point, this increases the voltage required to get a spark.

Ignition problems normally show as hesitation when putting foot down.

[MarkBzero 296]

20 hours ago, Thrashed said:

Could the TPS be faulty?  

Easy to test but if intermittent could be a problem.

[MarkBzero 296]

17 hours ago, Andi said:

Sounds a bit fuelly

Andi 

I was thinking about it because I still have the old facet bullet filter fitted. It's been there for 3500 miles.

[geordie40 54]

I had similar issue on my SuperSpec and after changing spark plugs, lead ,coil (I assumed it was a spark fault)  it turned out to be a bad earth which was affecting fuel pump and relay which only came to show itself when the car broke down and wouldn't restart but after me inadvertently leaning on the battery for support I heard the fuel relay clicking on and off, tightened up a couple of chassis earth's and hey presto.

Also found main earthe from engine block to chassis was corroded and only attached by a couple of strands.

[brumster 706]

1 hour ago, MarkBzero said:

I was thinking about it because I still have the old facet bullet filter fitted. It's been there for 3500 miles.

I mean, it could be many things but the minute you said that...

 

[richyb66 1,194]

Is it only running on 4?

[MarkBzero 296]

32 minutes ago, richyb66 said:

Is it only running on 4?

I only have 4, if it started running on 8 I would be happy.

[MarkBzero 296]

OK replaced the bullet facet fuel filter. But made no difference, cutout 3 in the weekend on the way to camping venue.

It was pointed out that there was a miss-fire in the run out, so ordered new plugs and leads. No harm having a spare set for the future.

I am intending to replace the ECU from megajolt to ME100 to power the vvt but would like it to be running right first.

Details twin 45's with 5 progression holes set up by Bailey performance, ST170 engine with megajolt, facet fuel pump with fuel pressure regulator set at 2.5.

[richyb66 1,194]

Coil? 

[MarkBzero 296]

1 hour ago, richyb66 said:

Coil? 

I will get another coil, a useful spare to carry for other club members at shows.

[richyb66 1,194]

2 hours ago, MarkBzero said:

I will get another coil, a useful spare to carry for other club members at shows.

Get 2 just so I'm covered. 

[MarkBzero 296]

Ford coil pack £78 and Euro car parts £18 I wonder what quality difference will be and how long it will last!