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Cold start problems but when started runs fine bought new battery,spark plug ,ht lead,cap

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Poor engine compression can cause poor cold starting. This can be caused by worn piston rings where the problem is made worse in cold weather due to the metal of the piston already worn piston rings contracting even more. A compression test would confirm.

Posted on Dec 01, 2014

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Did you check to see if fuel is getting to injectors on cold startup! If you have starting problems and the "check engine" light doesn't come on, you may have a bad engine coolant temperature sensor (ECT). Good-Day

Posted on Dec 01, 2014

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Engine runs at idle all plugs fire, but when the engine is throttled is starts to miss and runs rough if i put a strob light on the ht wires you can see the miss fire on all the leads


If you can see electrical sparks across the ht leads then you may have a tracking/shorting problem somewhere.

You haven't said what vehicle you have, but a rotor arm or distributor cap can crack and cause the problem you describe. As can a coil/ignition pack and of course, the leads themselves.

There's no real way of testing ht leads apart from replacing them. The same applies to a rotor cap and rotor arm.

Check inside your rotor cap - if you - can - look for 'tracking' marks... burning. Try cleaning it and spray everything with an ignition sealant to see if that eases the problem.

However, replacement - if you suspect any of these items to be at fault - is the only real answer


ignition sealant Google Search

Mar 12, 2016 | Cars & Trucks

1 Answer

1990 geo storm sohc is running rough. Parts that are new: cap, rotor, plugs wires,plugs, pickup coil, and the ignition module looks brand new. The coil is old, but is still sending spark through all t


the timing is 180 degrees out so ignore where no 1 lead should be and rewire the HT leads to the new position for no1 cylinder. The crank timing mark should be on 10 degrees advanced. Engines are timed off the crank position so forget the cam position.
Or you can start again. Remove no 1 plug and turn the engine over until you feel compression under your finger over the plug hole. Set the timing on the crank to 10 degrees before tdc. Position the distributor so that the point of the star is directly opposite the exciter coil in the distributor. The rotor button should now be facing no 1 cylinder plug lead adjust the HT leads so that they will fire in the 1342 firing order. Start the engine and with a timing light attached to no 1 plug lead adjust the timing mark to specifications by turning the body of the distributor.

Nov 06, 2014 | 1990 Geo Storm

2 Answers

2000 Engine runs rough, cuts out/dies in wet weather, rain, water


I was having the same problem. None of the explanations actually helped. Finally, a friendly mechanic recommended to me that there is an aftermarket splash guard that can be fitted on just inside the the front wheel that kept the water from splashing onto the distributer, etc. This worked like a charm. I'm having the same problem with another Jetta now, but can't find where to buy the spash guard. My friendly mechanic doesn't remember. But this is definitely the answer.

Dec 15, 2008 | 2000 Volkswagen Jetta TDI

1 Answer

2000 Volkswagen Polo runs rough and dies in wet weather and rain


Girlfriend's 99 Polo had same issue. In fact it recurred yesterday! Anyway, am not expert, but it seems to be due to deposits building up inside distributor cap area and then getting damp in wet conditions, causing shorting of ignition 'signals'. Found solution is to clean inside cap every 6 to 12 months with a cloth and IPA (or water if you're stuck - just make sure to dry it properly!) and the problem goes away. Silly thing about her Polo is that there's no decent splashguard to protect the engine area from splashes from puddles etc. I've lost all respect for VW coz of the amount of silly things that have gone wrong with her car...! Hope this helps - sounds to me like it's exactly the same problem.

Dec 15, 2008 | 2001 Volkswagen Jetta TDI

1 Answer

Cranks but will not start.


Ignition coil or distributor cap. Not knowing the Avenger I couldn't tell you where to find either but follow the HT leads from your plugs and you should find them. If you aren't getting a spark on any plug then the perp is your ignition coil and it'll need replacing, if you're getting a spark on some then it's the dist cap, check the contacts and give them a clean and see what happens. F.Y.I. the dist cap is the first thing back up the line from your plugs with all the HT leads going in, and the ignition coil is after the dist cap.

Nov 09, 2008 | 1995 Dodge Avenger

2 Answers

Fiat Sicentio 1.1 (02 plate) problem after changing spark plugs


check spark plug gaps are set correctly and that leads are in correct order if you took all leads off at same time its easy to mess up just one or two

Nov 08, 2008 | 2007 Fiat X1/9

2 Answers

Mercedes clk200 only fireing on two cylinders


There are several things it could be and not necessarily to do with the plugs.

1. did you reconnect the ht leads in the correct order? They must be in the correct firing order.

2. have you tested the HT leads for electrical continuity? The carbon powder type can breakdown easily.

3. Are the HT lead connectors ok? Make sure you have continuity.

Aug 22, 2008 | 1996 Mercedes-Benz C-Class

3 Answers

1993 mercedes sl300 convertable


Hi,
The early 300 SL suffered from dodgy HT leads and spark plugs if not regularly maintained, the problem with Mercedes Benz though is that the cars have so many features that it is almost impossible to diagnose without seeing the car. Some things to try (in this order) are : - Spark plugs, Ht leads, remove and clean Distributer Cap, replacement of HFM sensor (common fault), if none of these help then faults have been known in throttle valves and fuel pumps/filters

Happy fault finding

May 25, 2008 | 1993 Mercedes-Benz Mercedes Benz Sl Class

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