My sons truck backfires when he starts it in the morning and we were wondering what would cause this?

Question:
he has changed the crank shaft censor and it worked for awhile and he has already changed the egr valve once it starts it works great but the backfiring is really starting to annoy him we need help

Answers:

Are there any vintage VW parts dealers in Michigan?

i own a repair shop and i wish you had told me the year of it ,i might could have helped you with it,the year makes a big difference in them when your answering a question about them,good luck.

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The budget and 4x4?

Have you checked the timing? It could be off time

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Porche 959 in arlington, tx 76016?

Vacuum line off somewhere will cause a lean condition. Backfires are from too lean or firing too early (computer timing).

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How do I change the oil filter on a 2003 Ford Ranger?

Timing could be off or it is getting too rich of fuel to aor mixture.If it is carbuerated adjust the mixture, if fuel injected have the injectors cleaned

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